If you want a joke answer, I'd say every white receiver who lacks sub 4.5 speed. You'll see guys like Shipley and Collie compared to Welker even though they have very little in common from a physique/skill set standpoint. It's the new lazy comparison trend, sort of like how every 6'2"+ white receiver was compared to Ed McCaffrey for years. If you want a serious answer, the easy choice for me would be Davone Bess. He's very similar to Welker in almost every regard. Like Welker, Bess put up big stats as a collegiate playing in a friendly passing attack. Both went undrafted despite their successful college careers because they lacked prototypical size and speed. Both are short, squatty possession receivers who excel in the short passing game because their initial quickness and agility allows them to separate out of routes. They're also built almost exactly the same. If you look at what Bess is doing in Miami, his stats mirror Welker's days as a Dolphin pretty closely. I think they're similar talents and the difference in their production is mainly due to situational factors.Eddie Royal isn't built as thick as either player, but he's a lot faster. I would say he's more of a Santonio Holmes/Derrick Mason.