I think if the argument was a good, complimentary crew is essential and a qb, even a great qb can't do it alone was made... no one would argue.
But if the argument is that Joe Montana and Chad Pennington in their primes are equal or that Jeff George was in reality the best qb of all time... or that Cam and RGIII right now are better QBs than Brady and Peyton, but...
It's a little tougher to swallow. After all, who was the best qb we've had since the glory years (excluding possibly this year)
Brad Johnson. Brad Johnson of the noodle arm, slow foot, mediocre accuracy, etc was better than Donovan McNabb or Jeff George (with much better measurables on the same exact team) or a dozen other physically superior specimens. For this reason, if no other, Oldfan's theory doesn't wash.
Put Brad Johnson and Jeff George on the same team with the same coaches and if it were the measurables that mattered most, velocity and spiral, strength, speed of foot, agility, etc. Why in the world was Johnson SOOOOO much better.