I think the optimism stems from the fact that Kesler all of a sudden became a 2-way player basically overnight, and Horvat has a higher offensive ceiling than Kesler.
That being said I'll echo the sentiment here. He has a ways to go before being considered a shutdown type center. It's a reason why Sutter is still here / gets premium minutes and why Beagle AND Schaller were seen as necessities.
I think Kesler was always good defensively but I could be wrong.
Anyway - I think Kesler and Horvat are stylistically different. Kesler has always been a two way forward. Much like a Linden, Bergeron, Toews kind of guy.
Horvat on the other hand, is more of a power forward. He’s of the Jason Arnott/Jeff Carter mold. Even if Horvat isn’t blowing men into the boards, he’s still a guy that uses his strength down low to win puck battles.
For those of you waiting for Horvat to become a Selke nominee, don’t hold your breath (actually -@Melvin you have my permission to hold your breath). Horvat is a different breed of animal.
Cows are meant to be milked, just as a two way forward is meant to play a 200 foot game. You can try and milk a bull all you want, but you aren’t going to get milk from a Bull. You will get something entirely different. Similarly, most power forwards aren’t going to superb defensively.