As for the whole "the cabinet will mellow him", "he can't do anything without the parliament" and so on, according to this German article, people said the exact same things about Hitler when he was made chancellor...

http://www.zeit.de/2017/05/adolf-hit...nung-jahrestag

Other quotes include "I got Hindenburg's trust, in two weeks we'll have cornered him that he squeams" and that Hitler would now have to prove "that he is capable of being a statesman". Many people also saw him as a puppet of other actors such as vice chancellor von Papen.

Of course I have no idea why or how any of that could be relevant for this thread.