TCs assessment to me is saying he is good at a lot of things but not at putting his winger away.
He is better than most, unfortunately people want him to be more.
I know it is a stretch but I woud use Mal Meninga as a comparison. If you watch him in the early 80s he is one of the worlds best centres but what he was good at was breaking the line. His winger, whether Sean Day or Eric Grothe got the ball after he broke the line.
He didn't start putting his winger away before the line until later in his career when he started slowing down.
For me Ryan is the same, just probably not quite on the same scale.
He will break the line more often than not, and that is something many teams don't have. His winger won't get the money ball that puts him away until after the break is made. Not a bad thing in itself but doesn't look good when the defense gets you first.
I think that makes him a good centre who will score lots of tries. It doesn't make him Matt Gidley......but then Mal Meninga wasn't Steve Rogers or Brett Kenny either!?!?