I truly struggle to comprehend Scottish Labour, who seem to be in an unprecedented state of open revolt against their own London leadership (good) for an incredibly stupid and destructive reason (bad). One thing that everyone seems to privately agree upon is that an independence referendum is now virtually inevitable, and that the only question mark is over the timing. If it's coming anyway, what possible benefit is there to Scottish Labour or the future No campaign in being seen to have implicitly threatened using English MPs at Westminster to try to prevent a democratic vote taking place? It would be an albatross around their necks, and Jeremy Corbyn is actually doing his level best to rescue them from their own stupidity.
I wouldn't necessarily disagree with the assessment that Corbyn is "weak", but the test of that in this case will be whether he now backs down from his sensible and strategically sound comments today in the face of boneheaded Scottish Labour intransigence.