Thanks for the welcome!
Yes zero threat is hard to prove, it is impossible to watch every turkey. A meadowlark is zero threat to quail yet it cant be proven. Have you seen turkeys eat quail or stomp on the nests? Im curious why people keep bringing up this opinion. And you are the first person that I have ever heard bring up squirrels as predators of quail...
On a brighter note, the weather has been extremely favorable to quail hatching in Missouri this year.