I haven't seen the movie yet. Apart from the "clothed with immense power" remark, this is the only real complaint about the movie's historical accuracy that I've seen. If that's all there is to fault in that regard, it must be incomparably more faithful to reality than most of Hollywood's historical dramas — if not, indeed, of
all the others!
As to the quotation itself, it does not seem to be in Fehrenbachers'
Recollected Words at all. Or am I just not seeing it?

It comes from John B. Alley, doesn't it?