Nail - Head. I've found that in the Sports Section, very few of the regular pro's will be shooting raw, time constraints, reduced burst mode size, the requirement to get the pictures wired off before anyone else, and simply the size of the files preclude anything that takes extra steps in post-production - in short, its down to "getting it right (or as right as possible) in the camera"
for the OP's particular set of circumstances, I'm going out on a limb here and guess that most of the constraints I mentioned above wouldn't necessarily be in force - though the over-riding factor could still be the speedier handling in burst-mode to get "the decisive moment" shot.
FWIW, i'd be taking the "set a custom WB" and shooting in JPG route, but that's because I missed a few shots the last time I tried using RAW through having to wait while my camera was "buffering"