Rupp will finish with no better than 2:05 as his best marathon. You guys can talk all you want but you know it's true. His 10k time on the track means absolutely nothing to the marathon, look at Tadese and his half PR. Even Canova has said 2:05 is his peak.
2:05 is actually pretty optimistic. Are a lot of people even thinking he will run that fast? I think 2:05 is in the realm of possibility, but if I had to bet on Rupp's final PR I would guess 2:06 or maybe 2:07.