There's less travel because Japan is smaller, but their schedule is still very hectic. The hardest working guys in WWE and DG actually worked the same number of total matches last year (BxB Hulk and AJ Styles both clocked in at 173 matches over the course of the year). Lucha style if famous for being extra safe but you've also got some puro mixed in there, which is historically the most damaging style, speaking in a very broad sense at least, and it can definitely add up over time.

I'll always remember Kotoka as a comedy jobber who was too weak for Don Fuji to even feel his chops, and he excelled in that role. Not sure where he would have gone but definitely sad to retire so early. Then again, better to retire than stick it out and end up completely jacked up for life.