A lot of the arms have SP traits. Thing is, the team just needs to put some of them right into the MLB pen just based on depth. They can't all start.
Ryu
Pearson
*assume one MLB addition
Ray
Stripling
Roark
Merryweather
Borucki
Gooch
Hatch
Kay
Thornton
Zoinks
Murphy
Wag
SRF
If they are all starting then, barring injury, you don't even have room in the AA rotation for SWR, Murray, Luciano, Manoah.
So you need to pick some relievers. And you can't put s***** depth starters into the pen and expect them to succeed, so the tough thing is that if you want good relievers you kind of need to make tough decisions and plop some good arms in the pen.