I assume you mean because he can run well and steal some bases, but Kendall's bat was significantly better than Realmuto's...Jason Kendall may finish with more WAR over his career than Yadi....let that one sink in.
Realmuto didn't hit a lot in the minors and appears to be that rare case of a player who hits better in the majors than he did in the minors (errr maybe last year will be a career year offensively). I don't think there's anyway to look at Reese and predict a similar outcome unfortunately.