#and able to decile Curumo

[eri-pl]

Even if Sauron had come back after the war of wrath, and been good again and all, Curumo would still fall.

Imagine: little Mairon comes back, all messed up, crying or at least very miserable and all sorry, and all that.

What does Aulë do?

Aulë kind and humble, and not vengeful (see: him not being wroth at the Noldor ruining away like he was in BoLT)... I guess we can agree that he would throw a party. Because he would. He absolutely would.

And Curumo absolutely would feel offended by it. (Going with your assumption that he's somewhat jealous). And probably not only him.

But now, there's this problem when you are kind, but not great at interpersonal skills, and instead of two kids to manage you have a whole workshop of them, and they don't always voice their concerns clearly, and you don't read minds (well, unless they let you).

Aulë would either fail to notice that Curumo had a problem, or fall to explain to him that he's not less loved and all that.

And sooner or later, there would be results.