What if before LOT Rip/Time Masters somehow altered the personalities of the legends to suit them for whatever,and after they weren't there to control it it spiraled out in s2,except in Mick who due to being Chronos-ed didn't have that conditioning any more. That would explain how wildly OOC they are in s2 compared to more subtly in s1 (Sorry that's a bit of shitposting but the flash ep reminded me of the true Len and how some things bothered me about his characterization in s1)
I know you’re saying this is shitposting but actually, there’s this headcanon that @kesomon came up with called ‘Time Drift’ that I sort of love which is pretty close to this, except not done by any Time Masters directly, but it’s just a byproduct of being untethered in time.
You can read about it (and my thoughts on it) here :)
Of course it’s a bit of a far-out-there headcanon, but it... weirdly fits.