Estevez warmed up Sunday in a save situation and was ready to pitch the 9th inning, but the Angels scored 2 runs in the bottom of the 8th and Estevez wasn't used. He then closed on Monday and Tuesday. He pitched Thursday and couldn't find the strike zone and was pulled after 3 batters. Nevin probably decided that the almost close, followed by 2 closes, 1 day off and a horrible performance the next game, that Estevez was overused and decided to give him 2 days off.
Using Ingram with a 6 run lead is fine, but why would you let him pitch to a 4th batter, when he looked like crap? Why would you not let Webb start the 8th, since you only have 2 reliable pitchers left (Devenski and Soriano) and hope that both are on their game? Why would you not pull Soriano, who couldn't find the strike zone, when you pulled Estevez in the same situation 2 days ago?
Also, why bring Ingram up at all, since they have gone away from soft tossers, and not bring up Wantz who can hit 96 and shown he can people out most of the time?