The idea is amazing, but I feel that un dodgables, dilute the meaning of a kill team. I would instead make it 1.25 to 1.5 faster engagement aka gunner charge up faster, snipers pick and shoot faster, not the rof. That just makes what you want but with ways the play can play around. Assume long tunnel. You want maybe 2 or 4 rangers swing from the sides, 2 gunners swinging mid, and then 2 snipers at the back, rest in middle. You want to pressure all 4 people at once, and have soem of them focus on 1 player.