After Kau Mor Tze lost his inner power to a fire deviation in DGSD, he resolved to never practice martial arts again. His reasons were twofold: 1). he'd gained an epiphany through his near-death experience and became enlightened, and was therefore no longer interested in martial arts, and 2). it would be either impossible or extremely difficult to rebuild his inner power back to its previous level.
So was it impossible, or just extremely difficult? Was his system so messed up that he could never hope to regain his inner power no matter what kind of divine martial art fell into his lap or how hard he trained, or was it just extremely difficult considering he would have to start over from scratch and rebuild what had taken him decades to build up in the first place (decades he no longer had ahead of him due to his age)?