I don't know that anything's really changed about Seitzer.
The idea that he could fix a s***** hitter like Goins was proven to be ludicrous. The team's s***** hitters Sierra and Goins hit like s***** hitter. The good hitters have hit like a good hitters. The only exceptions are Melky, Lawrie, Francisco and Thole. Melky was only a s***** hitter when he had a tumor so to give Seitzer credit for that would be a real stretch. Homeruns aside, Lawrie actually seemed to have a better approach under Motolla and we don't know what if anything Seitzer has done to fix Francisco. You'd expect a guy with his kind of power to go through hot stretches. Maybe what Francisco is doing is like Bautista breaking out in september of 2009 but it could just as (if not more) easily be a repeat of Randy Ruiz that same September. It's not necessarily because of Seitzer either way and it's way too early to tell. Thole will not BABIP nearly 500 all season. That much should go without saying. It's a good offensive team overall. That's not something new.
Mottola seemed like a good coach and the change still reaks of pointless favoritism. It doesn't really do much for my general impression of Gibbons but it's basically inconsequential. Other managers staff their teams with their buddies all the time. I guess that's their prerogative.