Chism's issue is speed. What people don't understand is speed and quickness are not independent. There are two different tests, the 40 and 3cone, so people think speed and quickness are detached. If the DB knows the WR is slow, then the DB can crowd and jam the WR with no concern for getting beat deep. If a Slot WR is jammed his separation due to quickness is reduced. The lack of speed leads to the defense playing the WR differently. That is why Chism III is not Welker, or Edelman, or Kupp.
What I find interesting about your "analysis" is that you talk about speed and quickness and guys getting jammed, but you talk about 40 speeds. The 40time is about LONG speed. You should be evaluating the players based on their 10 yd split if you're going to talk about guys getting jammed at the line. So, I took the liberty of looking those times up for you.
Chism - 10yd - 1.62; 3C - 6.77
Welker - 10ydl - 1.60 ; 3C - 7.01
Edelman - 10yd - 1.52; 3C 6.62
Kupp - 10yd - 1.57; 3C 6.52 (over 60% snaps from Slot with the except of his year in SEA)
Anquan Boldin - 10yd - 1.61; 3C - 7.35
Jaxson Smith-Njigba - 10yd 1.65 ; 3C 6.57 (23/24 primarily slot; 2025 primarily wide)
Puka Nacua - 10yd- 1.62; 3C- 7.32
Amon-Ra St. Brown - 10yd - 1.63; 3C - 6.90 (Primarily slot)
Michael Wilson - 10yd - 1.60; 3C- 6.81 (primarily wide)
Jakobi Meyers -10yd- 1.60; 3C - 7.07 (has played both)
Nico Collins - 10td 1.55; 3C - 6.79 (primarily wide)
As you can see, I took the liberty of adding a few extra guys who had similar 10yd splits and 3Cs who have been successful in the NFL. I added both guys who played primarily Wide and those who played in the slot. Because those playing Wide get jammed at the LOS the same way that Slot guys do.
Would you care to amend your "analysis"? Or are you going to stick to something that is clearly flawed?