I look at these “off” endorsements this way.
Trump has access to info we don’t have. He is a master strategist with a genius team assisting him, and has studied Sun Tzu and who knows what else.
He is play a long game and short game. If he endorses someone I think a total weirdo (Oz for instance), he has good reasons to do so, for reasons I am not necessarily privy to.
I am inclined to think along the same lines. I trust Trump.