I'm sorry, this question as posed does not make sense to me.
How can one discipline have all the skaters? (I'm not trying to be snarky) Do you mean where one coach has two of the three world champion medalists in one discipline and they come from one country?
It's already been said before, but IAM still has more world medalists than Eteri's group, AFAIK. But since I don't follow coaches and don't care how many medals a "coach" racks up, (as opposed to skaters, whom I do follow and do care

) I couldn't tell you for sure.