After Jimmy Butler’s devastating ACL injury sustained Monday night, the Warriors find themselves in a situation similar to one that occurred last season: A key contributor under contract no longer is able to play during a campaign where their NBA title hopes are alive and well.Like they did with guard De’Anthony Melton last year, could Golden State move on from Butler with the Feb. 5 NBA trade deadline right around the corner?“I don’t envision that,” Warriors general manager Mike Dunleavy told reporters before Tuesday’s game against the Toronto Raptors at Chase Center.In fact, the GM foresees the opposite for Butler, who was once his teammate on the Chicago Bulls.“Now that you brought it up, I guess I’d say what I envision for him is to kind of give us a boost next year the same way he did last year when he arrived,” Dunleavy continued. “At some point during the season, him returning and being the player he’s been. I mean, at his age, what he’s doing this year to have the year he’s had is impressive.“I think he’s got a style of game that can play for a long time with his skill, his...