I'm on board with the idea of separating the knowledge sphere from the trading sphere. But I do think an owner can be perfectly average in the knowledge sphere and still be successful. The "easy" way to do this is the Car Salesman way -- skillfully negotiating trades that are against the other owner's self interest. The other method is the Facilitator's -- skillfully negotiating trades in which the other owner rationally pays above-market value to fill an idiosyncratic need. These trades yield smaller gains, but several such trades each year will turn an average squad into an above-average one.
Supporting what youre saying, it might be wiser to consider the Facilitator/Car Salesman as a secondary personality axis. Thus, while people could be considered varying degrees of Scout (talent-focused)/Algorithm (scoring-focused)/Analyst (owner-focused), within each of those classifications are varying levels of Facilitator/Salesman.
Don't get me wrong; I agree you can have average knowledge but be excellent at leveraging what you have. However, to use another metaphor, examine potential vs. kinetic energy. That is, we all possess varying degrees of (knowledge/skill/insight); however, the manner in which we leverage that (knowledge/skill/insight) for personal gain is an entirely different matter. If you're really good at X, how do you make that work for you? Facilitating? Ripping people off? Hoarding players and refusing to trade at all?