Board Thread:Questions and Answers/@comment-181.169.122.222-20180918163827/@comment-10336-20180919042329

He boosts only only his stats, regardless of being a sub or a captain. Same for TM points, being a sub gives the same end of game multiplier as if he was a captain. True for all units.

I don't think there's any TM unit that boosts stats/points differently based on being a captain or not.