With the right software to use the data, and assuming GPS/position data is available, yes there are benefits. Maybe not with just one player wearing it but if the team was wearing it you could conceivably have software to analyze what is going on to make more immediate position coaching available. Basically it would be almost like watching the film of the game while it was going on and adjusting in real time as opposed to after the fact. You could also conceivably make some determinations about where the other team was as far as the line is concerned (since impact, direction, and velocity data could tell you what was impacting a player at a particular moment) and adjust for blocking/rush schemes.