MLB Service for prospects

[Swag_Daddy4_PSN]

I try to keep my minor league prospects in the minors as long as I can. I have all of my settings on manual. As I get closer to the playoffs and continue into the post season the “computer” auto selects my 26 man roster no matter who I have already set. For example, I had a AAA guy that was a 70 overall that I didn’t want to call up so they could develop. Will having this player on the playoff team effect the rate of development? Does MLB service effect rate of development?