In a hypothetical world where everyone is healthy (& pitching well) I think Peralta, Quintana, Woodruff and Myers have priority on spots with Priester likely having inside track on the 5th.
If Henderson has looked good when a spot is needed for Myers/Woodruff coming back he could maybe be transitioned into a multi inning relief weapon kind of role.
Would guess Patrick is more likely to be optioned and kept stretched out for when a future need inevitably arises.
A “fantasy” September staff could be something like…
SP: Peralta, Woodruff, Quintana, Myers, Priester, Nestor
RP: Megill, Mears, Uribe, Henderson, Yoho, Misio, Ashby, Koenig