When you say the B-29 'would've done it', it couldn't have....because it wasn't ready to drop ANY A-bombs UNTIL July 1945...if they had to do it, in the time-frame of the ETO, the closest, most adaptable aircraft was the Lancaster...One of the biggest problems the B-29 had, was achieving the 'high altitude,' for over long distances, as it's engines kept burning-out, and they didn't get that all sorted-out until the first-half of 1945, and the 'nuke versions' weren't ready until July...- I do believe that 'the worm turned' at Stalingrad....just like the Japs were first 'stopped in their tracks,' at Milne Bay...nobody realised it then, either...- But please don't mistake me on the B-29, it did became the Ultimate bomber of WWII; - I just believe the Lancaster would've dropped The Bomb, in the ETO - They were booked-in for 'Tiger Force' afterward, in the PTO as well...