(WC supporter)
Did certainly seem Masto said a little more than he was a nicely skilled but low endurance player. He has also criticised him heavily elsewhere. As have a few Freo supporters on the D&T board.
Anyway, like I said at the time he is a massive value pick at 17ish. He won't get a lot of the ball in his first couple of years but that doesn't mean he can't play the role of an impact player. His pace, vision and footskills just about guarantee he could still easily effect a match with only a handfull of disposals.
Just to qualify, I see Simpson as a mid (albeit a skinny one at present), which last time I checked was distinct from a flanker (as referred to in the post that you've quoted).