I just don't think that's true.
One, James was supposed to be that guy.
Second, Cooney was supposed to provide shooting, but I would imagine if you re-read the pre-season prognostications most people thought MCW was going to be a far better shooter, and most of the board still tends to think BT is a great three point shooter.
Anything he was going to give us was going to be a luxury in that regard. Since three point shooting was supposed to be his forte ppl are mad at it hasn't panned out (because we REALLY need it now), and because neither MCW nor BT is shooting the lights out it's more of a glaring problem. However, his role was always destined to be no more than the the guy that spells those two. Our lottery pick and senior SG, both of whom were always going to average well over 30+ minutes...Cooney was never going to be a big rotation guy - just the "as needed" SG that gives the other two a blow here and there. If he was shooting 50% from three he would have forced his way on the court, but that would have been the only way. At least imo.