From my data analysis, player attributes have no bearing in 4.5 on whether a WR is going to do well or catch the ball. It all comes down to broken plays, meaning plays that necessarily put the defense at a disadvantage.
That's why the slant routes like the FL Hitch are so effective. That particular play can be run by any SP WR with decent route because something inherently about it is broken.
For instance, one of the defense it does the best against in my database is the 4-3 Double WR2. Now, wait a second, this seems like the best play to run against the Hitch, but it routinely gets destroyed for big plays. That means game planning logic gets trumped by a play that's just broken.
The 221 Streak is another good example of a broken play. It's a long pass that goes to the RB 90% of the time, and always for a big gain. Why a big gain? Because a 90 SP RB will ALWAYS beat the LB to the spot of the ball if you have an LB cover the RB. It's the same way with most of the 221 passing plays. The QB holds the ball long enough for the RB to get out in front of the LB, and then the RB is gone because no one is near enough to play cover.
The only defense that works effectively against most of the passing plays right now is the Flat Zone, and again, it's because it's essentially broken. The LBs flood the hash on either side of the field, but that's where most of the effective passes are going to be thrown. Since proximity matters more than cover attributes, the LBs get a lot of knockdowns and interceptions just by standing around in the right spot for the ball to be thrown. And given QB decision making, it's ridiculously hard to game plan a play where the QB throws to the RB in the middle of the field that is ISO'ed on the MLB. And IMPOSSIBLE to game plan for the QB to throw a deep post route to a TE ISO'ed on a Safety. If that were the case, the Flat Zone would disappear from everyone's game plan overnight. But it's not.
The only time that player attributes seem to really matter is in the open field. I've seen plenty of 60 SP, 100 Route or 100 Courage WRs, break down coverage on a broken slant play and then slam on the brakes as soon as they catch the ball. And most technical attributes matter NOTHING on defense. Otherwise, this guy in 23 would have gotten no where near the stats he got playing MLB in a straight Cover 1 defense:
https://mfn23.myfootballnow.com/player/8786So for defense, SP vs SP still rules. And the only way to pass is to exploit broken plays. Nothing really changed since 4.2 except which plays are effective now.