Well, Seifer is just a big Pain in the a** most of the time. But if you watch him carefully, he sees Squall as his rival, and respects him for what he is. However, he always loved to fight for a certain goal (eg. Rinoa), i guess he just loves the idea of Instant Respect he gets from his postition. Even if he was an idiot most of the game, notice how he keeps beliving in his dream (to be the Sorceresses Knight), even though he failed repeatedlly. Anyway, alongside Squall, he was the best gunblade specialist in the Garden, so i guess that's one of the reasons he was in the comitee.