As is often the case on this site, data mining is the basis for most trips outside reality. Pick a subsection of a season--or, as here, a subsection of a career--and then make an overall point. So, here, pick 12 games to argue that Mathis was not an excellent defender or one of our best. Reality doesn't work that way, and stats aren't properly used that way. Now, if you want to make some sort of point about Mathis's last 12 games, have at it. That's fine. And when you see him tear it up next year on defense at St. John's, I'm sure you can also find a set of games that weren't as good as others. And then make a point about that set of games. But, of course, all of this is unrelated to the point that he was an excellent defender and one of our best. Or that he will be the same for St. John's next year.
We lost 3 of our best defenders, maybe the 3 best. I don't know if that hurts too much to recognize, or when players are gone they must be reevaluated as enemies. But none of those things makes reality not real.