Well, STF chars does not limit the diversity we can have in the game. It just limits players levels. That's where it is difference than a native cup.
-Well either what will be the rule, I suggest deciding it a bit quickly. In either case, people will show their respect and will be eager to play. Decide it quickly so that people can choose their teams more effectively at the moment, including their captains and the preperation stage will be lasting shorter. We should know, so we all can be prepared. If it's STF, the teams would be made of good players; if it's main chars, the teams would be made of high leveled-good players with a captain preferably as a cavalry class. Also, class restrictions; if any; will be taken into account as well in the latter.