FWIW that guy is likely more than enough- my Long B's tend to be guys with ~ 30 stamina and ~ 60 DUR. But I wouldn't have a problem playing a 50/20 guy, a 25/70 guy, a 90/10 guy, or really any sort of permutation. Really the only qualification is that he should almost always be available when the rest of your staff is winded- I'd use a 20/40 guy if I had enough workhorses to eat up the rest of my IP.