@Kirche No, I can say no because I'm rereading this. You have forgotten that wolves were eyeing his family from all directions. That's the one thing that actually had nothing to do with him. Not only the other local families that wanted the Xiao clan gone to steal their estates, but the Soul Hall was using the Yun Lan sect to ruin the clan and snatch the ancient key. Gu clan had sent Xun Er to find the key. It's possible Xiao Yan wouldn't have actually grown so close to Xun Er if he hadn't lost his powers because she (in addition to his old man) was the only person who still believed in him and didn't abandon him. Without that tribulation, who knows what might have happened. Yan Ran might not have had an excuse big enough to cancel the marriage. His brothers would have died due to the Yun Lan sect plots. His father would have still got kidnapped by the Soul Hall or the Gu clan. At that point, left without a background and largely powerless in the big picture, one faction or another might have got him as well, and, once again, Yan Ran would have rejected him, though this time he couldn't even have dreamed of challenging her.
So, no, in the alternate timeline Xiao Yan would most likely be a corpse, a Soul Hall slave spirit, a very mediocre wandering cultivator without a home, or in the very best scenario a perfectly unremarkable, average student at the Jia Nan Academy (although the whole Jia Nan Academy might be destroyed due to Xiao Yan not being in any position to deal with the essence flame going berserk).