I think sometimes Trump just endorses who he thinks will win when it seems highly likely anyway. That way he can be right. Meaning that I suspect that in some cases he accepts that his endorsement won't change it either way so he goes with who he expects to be the winner to pad his stats, as it were.
I think you’re right, but that undermines his message on MAGA when he’s endorsing people who want to assist the Democrats to make America into North Mexico.