That's some intentional cherry picking.
For example, in Keselowski's NNS championship year, he wasn't the best driver. Kyle Busch (a year younger than Keselowski) had 13 wins head-to-head with Keselowski while Keselowski only had 4. Busch averaged 170 points per race while Keselowski averaged 161. That difference over a full schedule would resulted in Busch getting back to back championships with Busch clinching before Homestead even started. But Busch only drove in 29 races instead of the full schedule. Those 29 races along with 6 from Brad Coleman were enough for JGR to still out-pace Keselowski's 22 for the owners championship. Keselowski got to compete against Coleman for 6 races and still couldn't put up a better season. And it wasn't really close, with an over 100 point lead.
And comparing wins as if every season is equal isn't really fair. You're using the fact they were better young drivers against them when that really should be a negative for Keselowski. Keselowski had two full NNS seasons before his full-time Cup ride and a third one on top of that before he was any good in Cup. He first had a good full-time Cup season when he was in his 27 year old season. Hamlin had been in the Chase twice before his 27 year old season while Busch had been in it 5 times before his. They immediately went upwards, instead of repeating the NNS. They didn't get time before going up or absolutely suck in their first full year like Keselowski did.
Keselowski's first full season was when he was 26 years old. Using full seasons, his 26 to 31 year old seasons (2010 to 2015) combine for: 7.4% win rate, 26.9% top 5 rate, 46.3% top 10 rate, and a 14.3 average finish.
Hamlin's 26 to 31 year old seasons (2007 to 2012) combine for: 9.3% win rate, 33.3% top 5 rate, 48.6% top 10 rate, and a 14.0 average finish.
Busch is in his 31 year old season, so his 26 to 31 year old seasons are 2011 to 2016. That forced a partial year to be included for 2016. Those seasons combine for: 9.7% win rate, 38.5% top 5 rate, 55.4% top 10 rate, and a 13.6 average finish.
Now Keselowski looks worse than them.
No matter what, the 2's fuel mileage gambles will forever have given Keselowski one championship. It is theirs. They earned it. Trophy will never be taken back. But anyone that watched the chase that year knows that without the fuel mileage gambles constantly working out, he wasn't the fastest that year and wouldn't have won the championship.