Since when do you need "speedsters" in the slot anyway?
Some of the best slot receivers in the NFL are not that fast...like Welker, Amendola, Bess, etc. They're good because they have reliable hands and run crisp routes.
Those teams do have speed options though Lloyd is the Pats deep play threat, Givens for the rams, and Hartline for the Phins. I see the value in having a deep play threat not necessarily running him out of the slot though.
Welker is not a speedster? Yeah ok. Whatever dude. This not even worth debating.
Coming from a guy who allegedly played beyond high school sports, you don't seem to understand the simplest of concepts when it comes to the game
Welker is not that fast... He's quick as hell and runs great routes and has amazing hands, but he's not a fast player and he's not a deep threat at all
Earl Bennett has led the league in drop percentage in the last 3 seasons, that's a fact... You're way off base when you say he drops a lot of passes, because he doesn't... He's dropped like 1 pass in 3 seasons
I want more speed from my slot WR. Johnny Knox would have been a better option. The reason you want speed in your slot is to create match-up problems. Maybe draw a LB on the slot if the defense is in the wrong coverage. Another match-up advantage is to draw the defense 3rd or 4th CB. But with Bennet's weak speed, I don't see him winning many battles.
Personally, I prefer having my speed guy/guys on the outside.
It forces teams to respect the deep threat, opening up things for TE/slot guys in the middle, guys who are too quick for NB and LBs, and middle to deep routes for the WR on the opposite side.