The white-bearded grandpa often came bearing gifts at the beginning of a story, and almost never did he decide to pop up a million words into a novel.
Of course, Wu Shan wasn't planning to play the secret (not) santa, either. He only cultivated as far as the upper limit of the Human Immortal state, and was an unspectacular disciple of his sect with an ordinary natural endowment when he was alive, or he wouldn't have risked his life to break into the Immortal state.
Therefore, he was essentially not one of those otherworldly sages.