The Cowboys started the season with a formidable three-headed monster at the wide receiver position. But those heads- Michael Gallup, Amari Cooper, and even CeeDee Lamb- are now dealing with their own separate injury concerns a few feet south, just as their quarterback appears to be over his own lower-body ailment. Gallup has been shelved since just after the opener with an injured calf. Cooper reaggravated a hamstring this past Sunday. And on Wednesday, Lamb sprained an ankle in practice, according to head coach Mike McCarthy.