Buchecha vs Roger Gracie at +99kg, gi, sub only — pick the winner and defend

Both at their absolute peak. Roger 2009-2012 era. Buchecha 2013-2015 era. 20-min match, IBJJF rule set. The argument I keep losing: Roger has the best mount in BJJ history but Buchecha has the best top pressure in BJJ history. So who imposes their game first? No coping out with "they wouldn't actually fight."