Our team prides itself on being student-led, so we have a student coach. This year was slightly more complicated than just that, however. I was our team's second driver this year, and I controlled our robot's shooter. Our shooter was almost completely automated, though, so I really only had one button on my controller. This allowed me to serve as a "team coach" while our actual student coach filled the role of "alliance coach". We felt this allowed our alliances to be more effective and unified. Also, because of some major upgrades to our scouting system this year, one of our mentors became more involved with strategy and scouting. Though he never coached us on the field, he did often help us plan strategy before matches*, so overall I would say we had 2.5 coaches this year.
*We are currently planning to have a student fill this role next year, to get students more involved again.