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There was several hint by this point in the novel about the MC thinking how he seems to have been a big Sword Cultivator and teach his disciple Sword Technique, like the 3rd Disciple who completely learned his Sword Technique but he himself does not have any memory of learning Swordmanship and his Sword techniques not the best due to that, which felt weird, how could he teach his disciples so well on swordmanship if he himself is not that good.
Manhua kinda skipped that, it was hinted again here I think when he saw his eldest disciple using Sword his techniques, we learn the reason for this in another 30~40 chapter or so.
Hohohoho