Kreider is what he is. He is not an enigma or a puzzle we are yet to figure out. He is a bloodhound, give him a scent and he will go fetch. That is if he doesn't get distracted.
I appreciate Kreider's effort on most nights, but I don't see him as an ideal linemate for Kakko. Kreider excels off the rush, while Kakko slows the game down. Someone on another thread suggested that Panarin and Kakko should be on the same line, I tend to agree with that point of view. Anyone defensively sound and or good at draws should be able to successfully center a line with Panarin and Kakko on it. While a line with KZB should more than hold their own.