I'd say suspect chin with an amazing heart, it's like one of my favourite fighters JMM. His chin is kind of suspect, but he has amazing heart, so he could overcome all them knockdowns.
The only one to knock Patterson out clean early was Liston who hits like a truck and has a vicious jab and a vicious uppercut which were perfect for a peak a boo fighter like Patterson. Frazier doesn't hit as hard as Liston and has neither of those tools. This would be a phone booth war and although I favor Frazier to win, something interesting could happen with 6 attempts. I think Patterson could even win 1 match bare minimum with the right game plan. Agreed. A relatively short inside fighter with a peak a boo stance who fought on the front foot and liked to throw uppercuts would not last long with a glass jaw.