Yes, because he hadn’t faced up to the extent of the problem. I’m not saying there isn’t risk or that it wouldn’t need careful bridge building, but if it was done well enough his enemies would eventually look unreasonable. That’s if a way back is what he wants.
Tough as this is, the current approach, to take on the leadership, has zero chance of long term success. Zero. Even if he, quite plausibly, wins that the loss of the whip was unlawful or a wrong decision under a JR, then what? He’s simply a peripheral figure with a milestone around his neck. In the eyes of most people, the man who never accepted his failings and worse and continual impediment to Labour.