I'm generally of the opinion that physicality is more of an inherent trait than a learned one. Physical play is as much mental as it is physical. That's not to say a player's physicality can't be improved, but it needs to be building on a mental foundation that's already there. There are countless examples of teams trying to cultivate that element in a player to no avail,. Kindl had good size but playing physical was just not in his wiring. Rasmussen is another one, he has all the physical tools but playing that way is clearly just not something that comes naturally to him. Then you look at a Kesler, or Tkachuk, or Marchand, and you see that element as a natural part of their game. Sure they can refine that element in terms of timing and impact, but they don't need be told to do it in the first place. In other words, you can teach a player how to throw a body check, but you can't teach them to want to throw a body check.
So I find it unlikely that Danielson would develop that particular element to his game if he hasn't really displayed it thus far. I agree with your other comparisons to Kesler, in terms of excellent 1v1 defense for example, but considering that physical chippiness was a pretty important aspect of Kesler's overall game I wouldn't say he's the best overall comparison. That's where Bergeron fits in for me as a stylistic comparison. Right-handed, quietly competent, makes the right play, excellent defensive IQ, and consistent commitment + effort.
Kasper, on the other hand, I can see developing into a Kesler-like player. Assuming he remains a centre with the Red Wings. He has that dog in him.
