Well, in the true timeline there had been one such plan, when Ganondorf had tried to take over the tower during the time the administrators were away to supervise Ruana's game. Granted, Sephiroth had not been part of is team as, for a matter of fact, Sephiroth wasn't in the tower back then. Hojo had been though... But that may be for the best that Sephiroth doesn't know this.

"I have waited long enough, trust me."

And Ganondorf would keep on scribbling without a word.