I second this requests.
My understanding is that your clan member/companion in the group number (in the highest slot) with your units, like gruop 1, 2, 3 and so on, will give their captain perks to that group when aplicable..... however it's kinda hard to to know if they're working. Somebody might be able to compare and contrast but really a person who looks at the code probably could just figure it out more precisely.