hockey has more concussions today than the clutch and grab days of the past. this is a 2 fold reason: #1 players are moving faster now - expected #2 clutch and grab actually penalized larger players, as it took more energy to get moving again (hockey is an endurance sport). now player size is inflating.

I think the football solution is to force players smaller again. One way to accomplish this is to weight pun salary caps by body weight. The sport can keep its old aspects.