because everyone knew Delpo would most likely be gassed as the match started. He was ill and had played two mentally and physically challenging matches coming in. He wouldn't have been the favorite regardless (no one really is vs. the Big 4), but it would have been a lot closer. And probably he would have been the favorite after winning the first then.
Look, I'm not saying he would necessarily have won, but everything in their match-up and prior history points to a closely fought match. The first set as well for that matter.
If Delpo had been well enough to compete.
But hey, who am I arguing with. I've given you every single argument there is and yet you refuse to admit Delpo's lack of energy played any part in the outcome
Btw - Rafa seemed in a slump post Wimbledon this year too. Losing to Shapovalov and easy peasy to Nick. One key difference between this year and the last couple of years was that he didn't meet an opponent playing truly well who was good enough to challenge him. If he had, who knows. But Delpo wasn't it.