He's headed for about 90/80/95/80, just a little better than that. He's also about done with the bat. That's still a major league SS, a solid one despite the extra errors, especially since he can sustain about a .700 OPS.
I don't think there's evidence that what SiteStaff have said about position mattering for defensive development is very important. If he helps you contend for the playoffs by playing ML 2B next season, go for it.