Mismatch. Ortiz went life and death with Martin whilst AJ didn't have to break a sweat. AJ neaten half a dozen guys with better record than Ortiz. A fairer match up would be Chisora vs Ortiz.
Ortiz is skilled but slow. AJ is faster and probably hits as hard if not harder. He's got more boxing IQ than WIlder as well - even if he is stuck between styles. I think the speed edge is crucial in this and AJ find the shots to put Ortiz away. He blew Martin away in 2 who gave Ortiz trouble and AJ does everything better than Charles Martin.