In an ideal world, yes. Practically speaking effective groups grow and develop based on shared goals and values. You can’t just put a LGBT person in a group for the sake of putting one there, especially if it costs a better performing person their job. Would you walk away from you job to give it to a non straight person, and how would the team feel knowing that how you identify is more important than what you can do? How about being handed over crap by a person and you can say or do nothing about it because they were hired on inclusivity principles and any issues with their work are just called bigotry and seismic?
If you hire based on inclusion, that is why that person is there.