Madara 5 Kage summit BT is generic support. He can fit will in the p2 slot generically with any type of team. If you feel like your opponent is using a lot of mysteries, and want his barrier up to stop mysteries, that's what role he can fill. Think of it as if you were trying to fit hashirama new year into your lineup. For example: Choji GNW, Hashirama NY, and Guy as a starter team. In this instance, Hashirama is stopping mysteries. So here, you can put Madara in over Hashirama to stop even more mysteries for the round.