For a road race, I can imagine riding in a pelton has an advantage against air drag.
However, for MTB this does not make sense. XC races are slower than road races, and in a DH race having someone closely in front of you seems to be just another way to fall from the bike.
So what does it mean a mountain racing team? How do they function as a team? How do they behave during a race?
I guess a team of professional riders will have near identical skill level. On the other hand, a team of amateur enthusiasts can have vastly varying skill levels. How does this affect the answer?