I'd put him at 4th for the past 20 games or so.
Earlier on he was getting out muscled defensively. Based on the eye test, he has looked better lately defensively. But I'd like to see if its a permanent improvement so I'd give him a one year deal.
I don't really see his career situation as unique from Sbisa. Sbisa was just thrown into the NHL an earlier age.
Both have struggled to find a top 4 spot. Weber is also a year older.
Sbisa was once a highly touted high 1st round pick. Like others (Barker, Parent etc) teams try and give these guys every opportunity. Sbisa has been tried in the top 4 several times by multiple teams. Every time he has, he's failed miserably.
Weber is a smallish, mid round pick. As even WD mentioned, despite having good results he was somewhat unfairly not given a chance. But the first time in his career, the guy was thrown a bone and to many peoples surprise, he actually handled it extremely well.
It's also going to be extremely difficult to teach Sbisa how to defend (his instincts are an issue, especially gap control and in front of the net) and more difficult to give him Weber's shot
These two aren't comparable at all in the type of opportunity they have received up until this point. But once they have, Vancouver prefers Weber beside Hamhuis in a top 4 role.