Aikman came into the league 35 years ago as the #1 pick to an abysmal team that only got worse his first year in the league. Different players, rules, refs, schemes, environment, competition, etc. There was a period of about four to five years where the team was top quality and highly competitive and he capitalized on it. Everything outside of that was on the way up or on the way down depending on which JJ had control.
Comparing their stats without this context as if this equalizes them is stupid.