Why? 650 yards a year and 4 td’s is chump.
By today's standards Staubach's numbers were also chump change, but he is considered one of the best QBs the NFL has had.
As for Pearson, he actually averaged 711 yards, but to put his (or any) career into those simple terms isn't really fair because it ignores all other variables. Aside from the obvious fact that it was a different time when teams didn't throw the ball remotely as much as they do now, one of those years he was a rookie fighting to get playing time, and another was shortened by a player's strike. Then there is the fact he was a major contributor and incredibly clutch player on a team that got to the Super Bowl 3 times, that was in the playoffs 10 of his 11 seasons as a player, and that I believe was the team that had the most wins in the NFL in the 1970's. Then, there was the fact that Pearson was Staubach's go to clutch guy. If the Cowboy's backs were to the wall, and we needed a big play to keep the Cowboys in the game, Pearson was the guy Staubach and the Cowboys counted on. Often it was a play over the middle where everyone, including Pearson, knew Pearson was going to get crushed by a DB, but he was fearless and would make the catch and hold on after the hit.
But if you want to go by stats, Tony Hill was as good a receiver as Pearson. But if you want to go by Cowboy fans and media who watched the two play and were old enough to understand what they were watching, Pearson was head and shoulders the better player.