I really can't stop laughing at people calling this "asspull".
What NotThor did is exactly inline with what his power is. Surviving a certain death counts as a miracle conceptually so of course he would return and of course it would increase his powers since its pretty much height of a hero narrative in any sort of work
And Hitsugaya's power makes sense. Not only Kubo hinted at it multiple times, but logically it makes sense the same way with what we saw happen to kenpachi this chapter - Kenpachi can't handle full power of his bankai yet. Just like Hitsugaya would not be able to years ago - so back then when petals went out, it would be unable to fulfill the last condition and disappear. Now after training its a different matter altogether.
People always refuse to use their brain...