It really depends how much power Crawford has and carries to 147. If he can't hurt Khan he's getting UD'd, Khan eats Southpaws for dinner.
Canelo knocked the last little bit of fight out of Khan. Khan is talking fighting in the MMA arena and fighting McGregor because he knows his boxing career is pretty much over. Any half decent fighter with ambition and desire beats Khan, his heart isn't in boxing anymore.
I picked Crawford to beat Postol, and now I'm picking Khan to beat Crawford. Styles make fights, and Khan always beats technical defensive boxers (just ask Zab Judah, Paul Malignaggi, Devon Alexander and Paul McCluskey.
I think Khan wins the first 2-3 rounds, then Crawford adjusts. Crawford is also more technically sound than Khan. Khan makes amateur mistakes.