Kronwall and Jbo are 2 different types of d-men... Do you understand that?
Kronwall is also not a 1D, so you're right. They aren't in the same realm. Jbouw logs MUCH tougher minutes and more minutes than Kronwall.
Thats like comparing Lidstrom to kronwall in the hit category. J-bouw isn't physical. He plays positional defense and uses his stick effectively.
It is still possible to compare defensemen based on overall skill and merit, do you understand that? JBo does eat minutes but to claim that he is good with his stick when he has twice as many giveaways as Kronner with only a few more takeaways does not backup that statement. And just because a guy plays against the hardest competition and plays against them a lot, does not make them effective at it. Look at Quincey. He played top-pair minutes for the Avs and is now a slightly overpaid bottom 4 defensemen for the Wings.
Quantity of minutes =/= Quality of play. Babcock could throw Jakub Kindl out there as a #1 D-Man and call him a #1 D-Man until he is blue in the face but the fact is he isn't a #1 D-Man.