Bochy lost a lot of trust in Otsuka towards the middle of last season and I doubt Otsuka has earned it back yet. Linebrink, however, has been the Padres best reliever for back-to-back seasons and, as a former starter, has the longevity to pitch more than 1 inning an outing.
In case you missed his September:
3-0, 1sv, 16.2 IP, 8H, 0ER, 2BB, 17K, 0.00ERA, 0.60 WHIP
He'd take the closer job if, heaven forbid, Hoffman doesn't return.