Man, lol, you have to stop with the excuses.
You just said WR production is a subset of QB production. Mac Jones, Trevor Lawerence, Daniel Jones, & those other Giants’ QBs’ productions are all mediocre-to-ass & they’re still vastly outperforming Marvin. Those guys seem to be QB-proof.
I mean, I've wrote about this before. The routes Marv runs Kyler cannot hit, it's that simple.
The other guys have poor QB play, but also QB's that can throw the routes they run.