I think Trump has an extremely well developed sense of self preservation but you're right that having someone else in the spotlight would probably present a major challenge to Trump's various mental illnesses.That would be the smart move, but Trump has never been known to be overly intelligent. I just don't know that Trump is capable of watching someone else in the spotlight and not trying to tear them down, or at a minimum make it all about him. Trump's support is too treacherous to be relied on, one bad day in which he loses a court case and Trump might spend an entire rally mumbling about how the Republican's can't be trusted, that every Republican is a RINO because the Judges he paid for are not siding with him. Biggerest hoax in the history of mankind! It is so Biggerer you would not believe it. All to bring him down.