#5 Braun Strowman
You can't have Braun Strowman in a match and not name him as one of the favourites in the said match. The tallest, strongest and most menacing participant of Money in the Bank could certainly decimate his competition and come one step closer to the Universal Championship. After all, many fans have been pushing for him as the next Universal Champion anyway!
However, I just can't imagine Strowman with a briefcase looking for the right time to cash his contract in. He's too much of a 'monster among men', to play this role. While it's impossible to rule him out of contention, I think these other men are more likely to win the contract.