Board Thread:Versus Debates/@comment-25643824-20161223231153/@comment-9782468-20161224060900

I don't think 1000 is the limit, just the ball park for what Naruto can comfortably create.

And Sasuke stopped Naruto from creating Shadow Clones because it's a form of Ninjutsu, and apparently Momohiki can absorb it somehow. If he absorbs Shadow Clone Justu, he can cast it too.