I do agree that he's not a finisher of hard things.
@CripplecreekAt some time early in the campaign, I read an interview with Schwartz. He was with Trump when he (Schwartz) was writing Art of the Deal. He determined Trump was not right in the head, was vindictive to others, and wished he had never written the book for him and wouldn't do it again.
I read yesterday some psychiatrists across the country are considering not going by their rule of making a diagnosis only when the person is with a psychiatrist, and making their diagnosis public, for the good of the country.
"I do agree that he's not a finisher of hard things." If you study the many court cases against him and his court cases of those he sued, he is bombastic before the cases, claims everyone is not fair including the judges, but at the end, he settles, giving money to get out of the cases, most of the time before the case actually gets to court, or settles soon after it actually goes to court. So, you are right he is not a finisher.
He will either leave and claim victory as one here said, or he will claim an illness and quit (I believe he does have illness of the mind). And, of course, if the investigation turns up something concrete against him, he will quit claiming victory. He must have victory he can claim even if it is a figment of his imagination.