My experience differs. When we were kids, a mate of mine could play all kinds of widdly-widdly stuff, very technically accomplished, exceptional coordination. He couldn't create to save his life, however. He had absolutely no creative gift, everything he wrote was mediocre and, when he tried to solo, is was just a mish-mash of licks of the players whose material he had learned through reading tabs. He had no musical voice of his own. That well was dry. I used to know a clarinet player in an orchestra for whom the idea of writing or improvising something of their own was an entirely alien concept which did not compute.
Being a coordinated player does not correspond to being an interesting creative spirit and vice-versa. That this lad has taken the time to learn so much of other people's material and try to pass it off as his own suggests that he is not well endowed with a creative brain. At the risk of a generalisation, you'd expect creative people to spend their time... well... creating, rather than learning other people's material forensically.