After quitting the track last summer at the World Championships, the four-time Olympic and six-time world champion, was back in the capital.
Rob Pope ran a record time for a runner dressed as a film star, crossing the line dressed as Forrest Gump in just over 2 hours 36 minutes.
Winner Kipchoge and runner-up Kitata were also wrongly classified with 10 or 11 seconds added to their times as well.
Tops with men's race. "I didn't go with the faster group because the faster group was quicker than I was at the start", Cheruiyot told the BBC.
"I ran a really lovely race, " he said.
It is so different to the track. It's incredible. It's a different pain, different training but I've really enjoyed it.
"I gave 110% like I always do. I got a personal best, I won with a pacer, I fought as much as I could". "But at the end of the day you've got to fight like a man".
Seasoned athletics journalists and commentators perhaps saw what was coming but even they could have been forgiven for getting carried away with the prospect of Keitany breaking a record which has been insurmountable for so long. It's some payment for the fact that I haven't seen my kids in three months.
That was despite confusion at a water bottle station earlier in the race where he missed his drink and turned back on the course to collect a different bottle before being involved in a heated exchange with one of the motorbike safety officers as he made his way back to the front of the race. "I was table four, but the staff was trying to take pictures and I was trying to take a drink".
The young royal cheered race participants on in all categories including men's, women's and wheelchair events.
Olympic 5000m champion Vivian Cheruiyot sprang a major surprise in the women's race when she upset a stellar cast to complete the Kenyan double.
Keitany and Dibaba, who were sportingly sharing drinks in the opening segment, were ahead of Radcliffe's schedule through five kilometres in 15:46 and 10 kilometres in 31:46. But Dibaba was soon reduced to a walking pace to leave Keitany with only her two male pacemakers for company.
Jones ran the course in two hours, seven minutes and 13 seconds, meaning that Farah has taken nearly a minute off the time.
The 34-year-old was followed by fellow Kenyan runner Brigid Kosgei, while Ethopian Tadelech Bekele claimed the third spot.