I dont think Trump will pick anyone of the other candidates that he competed against.
What makes you think that? I think he won’t pick anyone he was competing with. Out of all of them, I think Kasich would be the only one with any chance of being picked, and that’s mostly because:
1) He’s got a generally likable personality
2) He’ll help Trump win Ohio
3) He’s got executive government experience
With that all said, I don’t think it will be Kasich. Maybe someone like him, with similar experience, but not him. This campaign has been pretty ugly, Trump will want to bring in someone fresh so the Dems will have to do their own opposition research, not just rehash everything we’ve been over in the primaries to a general election audience.