Kessler would outwork Dawson quite easily. Dawson takes so much time off in his fights throwing only intermittently. Kessler might even knock him out. Kessler is a much more assured and and all round fighter for me. Dawson either attacks or defends, he seems to have no fluidity between those two things. Kessler would take advantage of Dawsons flaws.
Dawson reminds me of Taylor from a few years back, all it will take is the right opponent to bust him up and Kessler would be one to do it.