A.J. Preller has a history of being very active at the Winter Meetings. The Padres’ general manager arrives in Las Vegas this weekend for baseball’s annual offseason showcase, and the stage certainly seems set for more of the same. The Padres have a wide open left side of the infield. They have a surplus of outfielders they’re looking to deal from. And, perhaps most importantly, Preller must address a starting rotation with very little certainty entering 2019.