Home runs per fly ball (and here I'm not talking about fly ball %) is one of those things a pitcher has some control over. Certainly more than control over BABIP. But not a lot of control like strikeout and walk rates. So it occupies an intermediate place in my assessment of a pitcher. Home runs per fly ball is something that does regress significantly to the mean if it is unusually high or unusually low. So I'm not too worried that Sims has had a high home runs per fly ball rate in AAA. He will give up his share. But if he limits the walks and is striking out a lot of hitters, he's got a good chance to be effective at the major league level.
I was joking about Julio last night. I for one hope he gets the next call up, but for some reason he gets the shaft almost every time. He is the only prospect in AAA to not get a MLB chance yet.