en.wikipedia.org/wiki/Multiteam_system#Leadership_of_multiteam_systems
(my emphasis. MTS = multiteam system)

Because of the complexity inherent within MTSs (including the possibility of competing component team goals), these systems present a unique challenge to leadership
…. importance to success of such systems … higher-level collective outcomes are obtained.

… research has demonstrated that effective interaction processes occurring between teams are more essential to MTS performance than are those interaction processes that occur within teams
… In other words, component teams within an MTS each could be individually successful while the system as a whole fails to meet its objectives

…. the core duty of the leader is “to do, or get done, whatever is not being adequately handled for group needs”
…. effective MTS leadership must balance the management of component team actions while maintaining cross-team interdependencies