He’s not the Lakers’ flashiest signing of the offseason, but Troy Brown Jr. has the skills to make a meaningful impact this season. The Los Angeles Lakers’ biggest transaction of the offseason may still be in the works — in the form of a potential Russell Westbrook-Kyrie Irving swap — but the Lakers have already made a handful of meaningful moves. Already, they have locked down deals to bring back a couple of big men in Damian Jones and Thomas Bryant. They also landed the first Mexican NBA champion in Juan Toscano-Anderson. On his way as well is Lonnie Walker…