John William Waterhouse, Diogenes, 1882
τί ἐστι;

John William Waterhouse, Diogenes, 1882

The corrected flow

Elenchus → Forms

Where Fine actually belongs — and what goes in the slot you gave her

What was wrong with the four-step version

problem of the standard elenchus → disavowal of knowledge → Fine's solution → Platonic Forms

The first two are right. The third is not a step towards the Forms — Fine's position is that the road does not need building. Put her in slot 3 and the chain stops moving.

What goes in slot 3 is Vlastos's own assumption (A), and his footnote 44 admitting it cannot be supported from within the elenctic dialogues. That is the gap the Meno fills. Fine, Irwin and Nozick all belong after the chain, testing it.

The spine — two strands, one destination

Both strands are Vlastos's. They start from the same practice and arrive at the same place for different reasons.

Strand 1 · the method's debt
0
The elenchus refutes but cannot establish
Robinson: it tells you that you are wrong, not why Rob. 17. Realising you do not know already involves grasping knowledge as distinct from all opinion — "a germ of the Platonic conception" Rob. 18
yet Socrates claims to have proved
1
The problem of the standard elenchus
Deducing not-p from the interlocutor's own q and r shows only that {p, q, r} is inconsistent. Yet Socrates says he has demonstrated the truth Grg. 479e, 472b, 474a
so he must be assuming
2
Assumption (A)
Whoever holds a false moral belief always also holds true beliefs entailing its negation. Only this licenses the move from inconsistency to truth
but is (A) ever argued for?
3
n. 44 — it cannot be
(A) is "unsupported and unsupportable within the elenctic dialogues" — because meta-elenctic inquiry is exactly what Socrates never does. It "must await the metaphysical grounding it will be given by Plato in the Meno" Vlastos ch. II n. 44
the Meno supplies it
4
Recollection
"transmigration and the theory of recollection ensure that true beliefs entailing the negation of every false belief are innate in the soul" Vlastos ch. II n. 44
and what is recollected must be
5
Stable, definable, one in every instance
Whatever is recollected has to be the answer to "What is F?" — the same in every case, not a sensible particular
Strand 2 · the disavowal's debt
0
Socrates disclaims knowledge — and argues anyway
He says he knows nothing about the "What is F?" questions, yet holds moral convictions "secured and bound fast… with arguments of adamant and iron" Grg. 508e–509a
Vlastos's solution
A
Two concepts of knowledge
knowledgeC — certainty — is what he disclaims. knowledgeE — elenctically justified true belief — is what he claims. He says so himself: "human wisdom" against a wisdom "more than human" Ap. 20d6–e1
but KE is trebly insecure
B
Elenctic viability is not truth
It shows only what opponents happen to believe; the evidence is inductive; and the elenchus is "a human process, a contest" — so winning may prove only superior skill
and why is KC out of reach?
C
Nothing about a sensible particular is necessarily true
Certainty is unattainable so long as the objects of knowledge are changing things. Vlastos's own account of the mature epistemology: it is "built on the restriction of what is known to what is necessarily true"
so KC needs objects that cannot change
D
Eternal objects with locked definitions
Things "whose properties are locked into their definitions" — the only subject-matter on which knowledgeC is even possible
↓  both strands arrive here  ↓
Terminus

The Forms

Strand 1 needs them because what is recollected must be a definable, stable one-over-many. Strand 2 needs them because certainty requires necessarily true objects. Two independent pressures, one answer — and Vlastos supplies the join himself, in a footnote he wrote in 1985.

Off the spine — the three who test it

None of these is a step in the chain. Each attacks a specific node, and the node number tells you what is at stake.

Terence Irwin
PMT 1977 · Plato's Ethics 1995
Hits node AThere are not two senses of "know." One sense, and Socrates has no knowledge at all — only true belief PMT 39–42 · PE 28–30
Hits node 4The Meno "does not introduce a new epistemological demand that was absent from earlier dialogues" PE 143
Verdict: continuity. There was never a debt.
Robert Nozick
Phronesis XL/2, 1995
Hits node 2True belief is too weak. Two mere beliefs are "on a par," so nothing stops you dropping the true one. Replace (A) with (K) — you must know — plus (R), knowledge is stickier Noz. 149–150
Reinforces node 3"elenchus… cannot be the only route to knowledge about these matters" Noz. 151
Verdict: the debt is larger, not smaller.
Gail Fine
Phronesis XLI/3, 1996 · Introduction 2003
Defends node 2True belief is enough, if the stock includes priority rankings among beliefs — and M. 97a–b and 85b–d say so Fine 240, 242
Blocks node 4Recollection explains why we have true beliefs; it does not supply knowledge we lack. "We do not know now, though we once knew" Fine 242
Rejects node AKE as "justifiable true belief" "collapses the distinction between knowledge and true belief" Fine 234 n. 4
Verdict: no debt was ever contracted.

How to state it in one line

Vlastos's chain: the elenchus proves more than its form allows → so it assumes (A) → (A) is unsupportable from inside → the Meno grounds it by recollection → recollection needs Forms. Running alongside: the disavowal splits "know" in two, and the certainty-sense has no possible object until the Forms arrive.

Then, and only then: Irwin says nothing new happens at the Meno; Nozick says the gap at node 3 is wider than Vlastos admits; Fine says node 4 never had to carry the weight. They are the examiners of the chain, not rungs on it.

One honest caveat

Node 5 and node D are the two places where the chart is doing more work than the texts do. Vlastos states nodes 1–4 and A–C explicitly; the step from "what is recollected must be stable and definable" to "therefore, Forms" is the standard reading, not a quotation. Robinson's warning applies: we must not say Plato "was aware of these variations in the abstract way in which we have described them" Rob. 28.