He made light work of Chisora while fighting on the back foot. Got dropped by Zhang and still came forward to get his own work in. He also dealt with another of division's heavier handed fighters in Makmudov. I pick Kabayel for this one. Does Wilder have a puncher's chance? Sure, but I don't think it's a particularly good one with Kabayel as his opponent.
Kabayel would force Wilder on the backfoot break him down with body punches and stop him. Wilder may score a knockdown at some point and hurt Kabayel but I see Kabayel weathering the storm.
Prime Wilder is a threat to anyone. Fury killed his punch resistance with that trilogy, but prime Wilder had a top 3 right hand (power) of all time, amazing grit, good chin, good stamina. He'd be a serious threat to Kabayel. 50-50.. maybe 60-40 Kabayel.