The issue with Schneider – or really most of the Canucks' latter-day goalies – is that goaltending has evolved more in technique (and I assume equipment) than any other hockey position, so pretty much the later in history you go, the better they are. In absolute terms, there is no doubt Schneider was better than pretty much anyone who came before him except Luongo. Mid-tier AHL goalies today are probably better in absolute terms than the star goalies of most eras. So I assume we're only looking at how they performed relative to their peers.
If that is the case, I'd say Schneider still is up there, even with a smaller sample size. He absolutely killed it in his time as a Canuck.
I'd also say (with no real reference to their placement on the list, because the Canucks rarely had star goalies historically) that both McLean and Brodeur are remembered as being far more effective as Canuck starters than they were. I've shown the numbers here before, but both actually only had one or two notable seasons relative to the rest of the league, and one memorable playoff run each. In 1991-92 McLean was full value – the rest of the time in the regular season he was quite middling, and the last few seasons of his career were pretty brutal. And I'm saying this as someone who loved the guy.
I have no issue placing Cloutier in the top 10 more or less by default; he did have some decent regular seasons, even though he was obviously on some good teams. By the eye test he always scared the crap out of me, though.