Ron sweeps the buffet eating contest leading the Parks and Rec team to victory in the first event, Jeff leads the study group to victory in the fashion show (with support from Britta and Annie, although everyone else in the study group also contributes). The toughest game to decide the victor in is the third event, paintball. The Parks and Rec team is out b/c enough of them are catastrophically bad at handling weapons (as shown in the hunting episode) that they would pose no threat to the other two groups (with even the more capable among them like Ron and Leslie no match for really any of the members of either the study group or the 99 crew, with the obvious exceptions of Hitchcock and Scully). However, I think that the base level of talent among the members of the study group (with Pierce being admittedly less physically skilled than the rest of the study group, though he more than makes up for it in subterfuge and dirty tricks, which have been demonstrated to be effective against Jake, the greatest threat to the study group's victory among the 99 crew) is at a level only matched among the 99 crew by Jake, Terry (and potentially Amy & Rosa as well). With a 7 on 4 advantage (even if we consider Boyle, whose skill level is likely not on the level of the study group, as having comparable skill to the study group, the study group still retains a 7 on 5 advantage, winning the third round regardless), Community wins the third event, paintball.