RE: He wants national exposure first.
I personally do not think that Vivek has a chance of winning the nomination and HE KNOWS IT.
Like Herman Cain, Pete Buttigieg, Dr. Ben Carson, etc., they are running for NAME RECOGNITION. At best, they are angling for appointment to head a department should Trump win. Even VP is a long shot.
You could be right. But I am curious why you think that. I can think of three reasons why Trump would NOT pick Vivek.