I don't think Zurdo has anything to offer Bivol besides size. I see Bivol winning a lopsided decision, but Zurdo is definitely sort of a threat if he fights real rough, clinching, pushing, shoving etc, he can maybe hurt Bivol inside the clinch due to his weight advantage. But I pick Bivol decision, 118-110 to 120-108 type victory.
I think Bivol needs to fight Beterbiev first, but I'll be happy if he fights Ramirez at the very least.
I would like to see Zurdo against the Beterbiev/Smith loser. Too bad he can't make 168 anymore, otherwise he would be a good comeback fight for Canelo. I'm not sure he even has a puncher's chance against Bivol, who was fine against Smith Jr and Canelo. I guess he could be one of those guys that needs a real challenge to bring out his best. I expect it will be lot like Bivol vs Smith, without the tension that Smith's power brings.