Look, you can't have it both ways. If you want to give EDC credit for all the picks while Ozzie was here, and claim they should be on his resume just as much as his picks post Ozzie, than the obvious implication is that Ozzie wasn't that important. I don't believe that to be the case, and have noticed a decline in quality personnel taken in the middle rounds (particularly OL) since Ozzie left.
Again, no one is saying this. Your implication stems from your own straw man.
The final decision maker gets the credit. But they arrive at those decisions based on the information provided by all the folks in football ops. You think DeCosta as Assistant GM for 7 years just brought Ozzie his coffee everyday? Picked up his dry cleaning, walked his dog? Deserves zero credit for anything player personnel related?