Ayon isn't that good...
I would surely take KO, Johnson, Sullinger, Jerebko, and even Perry Jones over him... There is no point in offering him a training camp position if there is absolutely no potential nor roster space or minutes to give him.
There was mutual interest between him with the Spurs, so I guess its a matter of context. The Spurs were looking for someone that could fit into their system, and could be had for affordability. Whereas, if we were to pick him up, it would only take up the minutes other players ahead of him surely deserve.