I suspect that Haye would cause Joshua more trouble than many give him credit for, he has the speed and power to trouble anyone and a wealth of experience. Joshua has risen to the top a bit too quickly, his management intended him to be a year or so later (according to interviews at the time) but a hole opened up for him by way of an available title, so he took it. I'm not saying Haye would win (although he might) but it would not be the one way traffic some seem to think and would, at very least, prove a real test for Joshua.