Tim Brown is an interesting comparison, as a top WR who also excelled in the return game, making him second only to Jerry Rice in all-purpose yards among wide receivers with 19,679.
In 16 years Brown had an impressive 4555 yards in returns.
In 10 years Wes has already amassed 6,366 yards in returns. There has been no dramatic revolution of rules favoring returns. If anything, it is harder now. No wedges, better kickers, moving the kickoff up, point of emphasis on illegal blocks, etc.
Wes is probably unlikely to keep returning a lot of kicks at this stage of his career, so lets freeze him after this year at, say, 6,500 yards, conservatively for sure.
Three more productive years at WR based on his last 5, and two years of half production, puts Wes in the ballpark of 950 catches (Tim had 1094) and 12,500 yards (Tim had 14,934), and 19,000 all-purpose yards (Tim has 19,679). Wes would be third all-time among wide receivers for all-purpose yards, though, by a wide margin. Tim scored way more points (632, vs. 237 so far for Wes)
Advantage Tim, admittedly, in many areas, mainly due to the humble first three years of Wes, without a WR role at the time.
But...
100 catches seasons? 1 for Tim, 5 for Wes so far (projecting this year as a lock)
Super Bowls? Tim got there once. 1 catch, 9 yards.. yikes
Wes? Twice, 18 catches for 163 yards.
Tim's teams over 16 years went 127-129 in the regular season.... yikes. Lots of yards and catches on bad to average teams...
Wes? 86-48.
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bottom line, Tim obviously has a big advantage right now in many important areas, but if you project Wes continuing at his pace for 3 1/2 more years, the gap gets narrower and Wes has a big lead in some areas: return yards, 100 catch seasons, winning, postseason excellence, and actually defining a position on the field-- slot receiver-- that had been relegated to a role of tertiary importance.
He is by no means a lock, but IF he keeps it up, he will make a very strong case.
Tim Brown should be in there, Chris Carter should be in there, and WR is a tougher "in" than are many positions.
Obviously winning rings would help. Lesser players with many titles have made it in over statistically superior players who always watched the postseason from their couch.