You have to think about how nerfed he was excluding haki, stats, sickness, and all that
Before he even started fighting Squard stabbed him in the abdomen. He went on to take hundreds of attacks from different Marines (including admirals) and kept trucking on. I think the tally was like hundreds of gunshots, hundreds of stab wounds, dozens of cannon shots, etc
This same WB still turned Akainu into a helpless baby. Before anyone says “Muh sneak attack” you’re telling me Akainu failed to react to a dying Whitebeard? That alone speaks volumes
Just imagine how strong Whitebeard would be if he hadn’t been shot, stabbed, or sliced hundreds of times before going back to back against admiral class fighters
He’s rolling Big Mom and smoking her. Kaido and Akainu are no different.