Makeup, patience are only very, very loosely related. Temper is completely independent.
Makeup affects how well the player will develop when he's young, and stave off decline when he's older. Patience can impact ratings somewhat in terms of promotions and demotions, as well as handling injuries. It also plays a role in the player's willingness to go for free agency or resign with your team.
Temper is pretty much an in-game rating, nothing to do with development. It will manifest itself in likelihood of getting thrown out of games for arguing. For hitters, it also impacts dreawing HBP's. Temper is the only rating in which the lower it is, the better. So 31 temper is pretty good (think of it as a 69, if that helps).
As fas as this guy's makeup and patience rating go: as long as he is promoted regularly, not demoted, and stays healthy (health rating of 99 helps a lot, but you also want to keep your training budget high), he should be fine. But he'll also bolt for FA at first opportunity to chase big bucks on the open market.
As for durability: yes, he's a starter. He'll be able to go every 5th day if you carefully watch his pitch count. But you may want or need to push him back a day every now and then.