Will sidney powell prove anything?

Answer 1

She has proven, definitively, that there is no real loyalty or integrity when it comes to Trump and his cohorts.  They are a cabal of self-interested opportunists who seek only to increase the value of their personal brands and they will lie, cheat, and betray each other whenever the chance arises if it means that they'll come out just a little bit ahead.

Have you ever heard of the Prisoner's Dilemma?  Trump and the people he surrounds himself with, would all fail to get the optimal solution, time after time, and they'd never realize that they're the ones making the error.

Answer 2

He has already proven himself to be a lying fool.