I think he'd be a bit like Briggs. Fighting nobodies, adding to a padded record, but when the title shot came, he'd give a very game performance. Tommy Morrison is a bit worse than Povetkin, but has that left hook, which can knock out anybody.
What is a prime Tommy morrison. with all due respect to the fighter, don't tell me he was in his prime when stopped by ex-marine late starter Ray Mercer, stopped in 1 by Michael Bent, walked around the ring and basically ran from G Foreman, or was it when he got stopped in some rounds by L Lewis? I am sorry, I can't see what is a prime Tommy Morrison, maybe when he had a street fight with Sly in Rocky V? Answering ur question, he would be absolutely demolished by either Klitschko, Haye, Adamek, Povetkin, Chagaev, maybe even outboxed by Chambers and stopped by Toney or Thompson.