"against certain styles." Yes. I don't see him at any point in history being favored over the slicksters.
If he had the openings that Galento had versus Louis, Tua would have closed the show. I love Joe Louis, but this is irrefutable. Tua really only needed a single punch to get an opponent on his way.
You make a really good point fighters of Tua's style never last that long whether it is a mental thing or physical.