i guess no exchange of info ever happens off-screen? the doting grandpa basically welcomed him to the clan then didnt receive any news about his training for 3 months. does no one in the clan chat or gossip? there must have been some form of rumors spreading given how everyone is constantly amazed by mc yet no one ever even bother trying to help him like giving him some basic elixirs despite being the grandson of the sword saint? imagine a world where billionaire entrepreneurs just put their kids in normal public schools and doesnt even bother keeping up with what they are doing. especially if theyve seen several times that the child is a complete prodigy. they didnt even start off by just making a basic assessment of his abilities. Or even just give him guidance. "you're doing good so far, keep doing it" he picks everything up by coincidences when someone runs into him and shows him something new. again they know he learns insanely much from just basic guidance and yet no one even bothers thinking that maybe they should try telling him things instead of just letting him follow same schedule as everyone else.
