Genuinely unsettled earlier by this hint of Boris trying to get back in.
Fortunately, he wasn't - notionally - removed due to partygate. Some MPs surely would resign the whip.
It's more likely these are the first salvos in the PR / legal battles coming, this is just him trying to save his 'legacy'.
If he can "threaten" his return, that suits him, more division is definitely in his favour. A suprising amount of "unfortunates" in the electorate will never be able to give up on him. Like beaten partners of the bad boyfriend who takes the money, abuses them and leaves, they will always welcome him back. The drama and stink around their return is actually part of why this happens.
Meanwhile, talking up even the slightest chance of a return will help him buy favour from the more credulous, desperate and greedy politicians.
I imagine tho this is him playing one of his best cards. The question is raised, then... why now?
I guess he wants to shake things up before Truss's announcement, put uncertainty into people's heads who might otherwise be looking to bury his reputation completely.
Frankly, tho, if he can support and advise Zelinsky, then that's very welcome, and his best bet for a positive end. He doesn't need to do that from parliament.