Holding on by one leg is not a sign of molting... you’d best hope not because that be disastrous... doesn’t look healthy to me. But give it some time and we’ll see what happens.
I don't think he is molting, it sort of looks like his leg is stuck. I hope he is alright. Has he moved at all? Less then a week seems a little to short of time for him to be molting again. But I could be wrong.
No that's not molting. Give him a light touch to see if he will get back on all 4 legs and walk. Hanging from 1 leg is generally not a good sign. Some honey for him would be good too.
Oh no, hope everything's okay. As others have mentioned, that is a bad sign and could mean that something is wrong. Keep us updated on how he is doing!