Hey M, I saw you post this question earlier on another post. You can find the original answer to this question posted here, under your reply.

Basically Jay has the right of it. Cashner left last season as a Reliever, and started this season as a Reliever as well. Just this last month, he gained his first two starts, and should be making his 3rd start tonight. This means that he will qualify for SP eligibility after tonight’s start, and should reflect such as of tomorrow, July 4th, barring any changes to who starts tonight's game.

I posted more detail on our fantasy requirements for position eligibility in your original post; check it out for more details on how position eligibility works in our fantasy baseball game.