Similar to what Arkinsoner said, Karlsson is a great fit on Ottawa and a very dominant defenseman, but in terms of salary cap, plus the fact that the leafs need badly to keep goals out of their own net more then anything, he wouldn't be the best fit on the squad. If the leafs could make it work and still have room to improve their D core, of course we would take him, but we have a lot of work to do where as he would just be more icing on an already explosive offence cake.