His plan really wasnt that much better, but Im not saying Rinoa's was a brainstorm. Storming enemy strongholds by yourself is dumb, most especially when your allies are climbing the backstairs. He put them all in danger. Stealth is much better in these situations, and as I said already, he alerted every soldier around to their presence. It wouldnt be hard at all for the enemy to regain the station within 10 minutes and kill Seifer. Very dumb plan.