It's 100% possible to have your one squad and still root for other players/teams.

Hell, sometimes it's just a matter of enjoying how a particular team plays. As a Lakers fan, I loved the Kings, unless they were playing the Lakers. That was a great team that played a beautiful brand of basketball.

There are plenty of players and teams I want to succeed, just not over/against the Lakers.

Right now I love the Knicks, Pels, and Bulls, and want to see each of them do well- until they play the Lakers, at which time they can fuck off over the course of 48 minutes plus timeouts and commercial breaks.