MOTS used in National Leagues, in some countries, could be problematics if are focused in 1 or 2 teams. In some games, that I he played, I remember teams withs pacts of "no agression" (no MOTS) and then his MOTS goes to the other rivals. Is not a fair game, and you know it happens more than we like.
The problem with MOTS is the GREAT effect that have in a match. I could understand the MOTS but with less effect, not so determinated. Actually with to similar teams (and not so similars) to put a MOTS is to win the match for sure (99%, GKO random always plays).
I am preocupated too, with the GREAT effect of playing in your own stadium in league... the effect is extremly great, I think.
MOTS are a problem in all competitions, not only in WCC. The teams not playing WCC can be "damageds" with MOTS. In the final of league could be more strategic to be 2nd in your league, than first (in a disputated league), because your rivals probably focus his MOTS in the first classificate. Is it real?