So what's the catch? That big and that athletic - what's missing? Does he have hands of stone or something?
It's hard to say because only NEAFL watchers will really have seen enough of him.
In some draft profiles I looked up the common theme was that, as a junior, he tended to fade in and out of games as a forward and that he tended to play his best footy in defence. As
yaco55 said contested marking against a defender has not been a strong suit (and this was part of the criticism of him as a junior).
To this point in his career he has really been more of a Watts/Gunston type of player who, despite his height, is more suited to using his athleticism on the lead from half forward and working back to goal. This is what I was getting at when I mentioned that he was even more mobile than Daniher which was a response to someone querying whether he was or has been more of a third tall forward.
Unlike Watts and Gunston, though, Stewart has the frame to fill out and it looks as though he has put on a lot of size in the last 12 months.
Remember that Stewart is probably 198cm (I'm basing height on comparisons with Ridley and Draper) and that he is Daniher's age. Daniher has only this season started to display the sort of physicality required of an AFL KPF.
Lobb played 24 games this year and Patton and Mumford played 23 each. It looks like Downie played the game Mumford didn't. Cameron played 20 games and Stewart got his one game.
There were virtually no opportunities for Stewart this year which, if we compare him to Daniher, is likely to be the first year that he had the physical maturity to consistently impact games.
It may well be that he is not up to it but there are a lot of variable that I would want to check off before coming to that conclusion. It's too simplistic to say that he was not playing at GWS and therefore was no good (which is not a comment which I am attributing to you).