Silva is legit. If Franklin wins I think it will be by Ground and Pound, or if Silva gasses. If Silva wins it's probably by knockout. It's hard to bet against Franklin but at 2 to 1 favorite against Silva I wouldn't lay any money on him.
Hironaka is a talented fighter and is very good, but he is going up against the machine Jon Fitch. I don't see him winning.
Good Luck