Naja - die Luft bei professionellen LOL SPielern ist wohl noch dünner, als bei Sc2.

Außerdem muss man da teamfähig sein. Da helfen dann einem auch nicht 400 APM, wenn man nicht im Team spielt.

Different set of skills required. I think it's actually harder to adapt, if you were at the top of the game from which you left. The instinct you rely on is set for an army, not one unit. You make different sets of judgments, based on your instinct. It's not something that can easily be rewired.
Larger competition pool maybe, not necessarily a harder game. Not really saying either game is harder though, just saying he has more competition in LoL.