You are wrong. The true reason that the Marines won is that the Match ups and WB health and holding back since Ace is hostage. If it was healthy WB and Kizaru facing Jozu, Marco vs Akainu, Ace vs Aokiji and Vista vs Mihawk, the YCs stall them long enough till WB wrecks mayhem on Marines.
This part:
"I love Whitebeard and I rate him high but the reality is that OG Admirals could take out his entire fleet if they were serious."
I meant about Sickbeard + his fleet.
Healthy Whitebeard is a completely different scenario I know.