Terry played college football in Louisiana. He was even here a few weeks ago to meet up with Phil Robertson (of Duck Dynasty) at a Louisiana Tech game.
So, he's a Saints homer and usually picks us. But, he's very up front about it most of the time.
In division rivalries, outside of the Saints / Falcon's rivalry, he usually picks the home team.
I don't know that he has anything personal against the Seahawks other than that the 49ers HAD to win the game if they wanted to keep their playoff hopes alive and that it was a home game for the 49ers, who are usually a tough team.