Kessler wins. Not because he's better, clearly Crawford is, but Kessler was a different animal at 168 than the absurdity overrated Canelo was.
Kessler was not a large SMW. He was naturally way smaller than either Ward or Froch. I think it would be closer than people realize. Kessler was tall, but narrow framed. I don't think he'd be as physically strong against Crawford as people think.
Has Crawford every fought anyone who outreaches him? Kessler isn't a big SMW, but dimensionally he might have Crawford trumped.
Kessler wide UD..............I'm saying this being a far bigger fan of Crawford. No active fighter at SMW is beating Kessler tbh