You can include Tyson Fury if you like, who fights ambidextrous but is mostly orthodox. The seven are: Usyk Byrd Moorer Ibragimov Sanders Chagaev Martin
Sanders is hard to rank because the golfer is limited but extremely dangerous: big power, fast hands, aggressive southpaw, good size, bags of heart and easy to underestimate due to chubbiness. Probably 2.