many videos where we watch the WR running a half jogging route with no one guarding him and the QBs just throwing it up. Of course, it doesn't look like there's a problem. There's no DB in there.
In order to execute better, you have to simulate what happens on Saturday. Full pads, no shorts, offense vs defense until they all get better.
When you're this bad, injuries in practice can't possibly make you any worse.