uh... no on masterson. he's a year ahead of bowden in the program, thats why he was up, not because they like him better or anything.bowden will be up late next year to the pen, like paps, lester, masterson and buckholtz before him.
the soxs follow a strict minor league to majors progression with pitchers, and they stick to it. this was masterson's year to be elligable for the pen with the innings cap, and they took it.
they asked theo flat out on one of the drive time shows if they would bring bowden up early and theo said "no, we belive in our system over rash call ups, and we have good depth there no need to rush him"
also, fastball speed isn't everything as you seem to think it is. brandon webb is a bowden esq pitcher and he hits 94 at best, and lives in 90-92 land. but he throws a "heavy" sinking fastball like bowden. how' that working out for him?
masterson is a nice prospect, but the latest scouting reports project him to be a solid middle relief/ set up man or 4th or 5th starter, due to lack of pitches (as you said, he has two dastball and slurve. in the minors, he struggled to get through the lineup the 2nd and third time around. he has electric stuff, but not much variety.)