I would guess pitching 2 innings every 2 or 3 days is better for the arm than pitching 1 inning in back to back games, 3 out of 4 games, etc. Look at all the pitches thrown to warm-up, which don't get counted in the pitch count of course. I think we've reached a point where a lot of the guys have actually said that getting up, warming up, throwing in the BP, sitting down, geting up again, coming in, throwing on the mound, and pitching to 1-2 batters, is more taxing on the arm than warming up once, and throwing 2 innings. Ned Yost used to do that... have guys get up multiple times during a game. It would drive me nuts. Like "man, that guy has pitched 60 innings this year, but I bet he has actually pitched the equivalent of 140 innings".