It's funny to think that if Nale had not decided to destroy Elan, his team might have been fighting along with the order when defeating Xykon in dungeons of Dorukan and had he survived the fight, he might had stopped Elan from touching the rune and could be in control of a gate by now. At least for the weeks Xykon regenerated.
That's true, but Nale never intended to help the Order vanquish Xykon. Xykon in fact hired Nale to kill the Order of the Stick, which he was only happy to do in any event after he obtained his Dorukan's talisman. He might have been willing to add Elan to his Linear Guild but not the rest of the Order, who he planned on eliminating, and he was never interested in fighting Xykon at all.