AB already passed Swann, a year ago. Let's compare the first 6 seasons of each HOF caliber Steelers WRs:
Player Rec Yards TDs
AB 526 7093 38
Ward 426 5053 33
Swann 240 3982 39
Stallworth 200 3568 31
There is no comparison here. AB is clearly killing it with receptions and yardage, and he's 1TD behind Swann. The first 6 seasons of Stallworth and Swann, they had a HOF QB, RB, and C on offense. The last 3 years, the Steelers were more of a passing team, and since they played on the same team for those years, they did have to share receptions with each other. Ward is also very impressive by eclipsing Swann and Stallworth in performance, while he played on a run first team. Ward was the go to player on 3rd down, and always worked hard to get as many yards as he could after the catch.
Career
AB 554 7462 42 6 years 4 games
Swann 336 5462 51 9 years
Stallworth 537 8723 63 14 years
Ward 1000 12083 85 14years
AB already has more receptions than Swann and Stallworth, and more yardage than Swann. He should catch Stallworth next year in yardage, and if he projects the same amount of TDs he got in his first 4 games, he can pass Swann this year. If AB stays healthy, and that's a big if, he has the ability to catch ward in 4 more years for receptions and yardage. The only thing AB lacks is TDs, and this year, he's starting to get them.
Even with the extra targets, AB is by far the best at route running WR that we've had. He moves like Rice in traffic, and nearly always gets space. He has excellent hands, though that is something that all of these receivers share. AB is also the shortest of all of these receivers. Good things come in small packages.