I honestly thought it would be around 50%, so I was suprised as well.
Wrt Karlsson, watching him these days I don't really see mobility as an issue, yes he has had injuries that had lingering impacts, but imo he's mostly recovered back to where he was (not pre Achilles, but certainly pre ECF run). What always astounds me is how effective he can be with major mobility issues (see our ECF run), and how ineffective he can be when you would think things should be improving (see the very next season after surgery or any other post injury reg season). The guy has a weird ability to flip a switch, but doesn't seem to know where that switch is half the time.
He'll finish his current contract at 37 years old, which might be a bit early for him to hang them up, so I could see him giving it one last contract. It wouldn't shock me if he takes a 2 year deal after this one and retire at 38, but I could see him stretching it out and either signing 1 year deals until he's ready to hang them up, or hold out for an initial 3 year deal the way Gonchar did with us.
A lot likely depends on whether or not he wins a cup while on his current deal. If he doesn't, he may choose to sign a deal with a contender to be a depth guy. If he has multiple cup rings by then, what would he really have left to prove.
Anyhow, this is supposed to be about Chabot more so than Karlsson. Chabot is a beauty, but he's got a long way to go to reach the peaks that Karlsson has. Hopefully he doesn't have the same valleys (or injury issues) though.
The good news for Chabot is that we seem to have really loaded up with D prospects to support him. That's not to say we didn't try to do so with Karlsson (Rundblad, Cowen, Wiercioch and Karlsson were supposed to become one of the best D groups of the future) but it didn't work out last time around.