Being a huge Brook fan if you'd asked me a couple of years ago I would said he would have way too much for Smith but now I'm not too sure! If the same Brook shows up that beat Zerafa then I'd have to favour Smith but that was one poor performance and we don't know if he is shot like Degale was or it was an off night! Wouldn't mind seeing Brook look good on the AJ card then box Smith, even if it's not for a world title/final eliminator etc it's a fight I want to see!
Brook after fighting almost no one has been in some tough fights of late with 2 big injuries. He's had a fairly long career now and wasted most of it. Smith would be the naturally bigger guy, his chin is decent and he's got a good engine. He would grind Brook down at this stage of Kell's career. It would be a decent fight and give the winner and spring board back to world level, it's a fight that makes sense across the board