I agree that the hens seems to arrive first and pick up calling activity in the morning and at fly up well before they’re ready to breed. Early season gobbling seems to be randomly located until the hens get more receptive and they hone in on these places.
I’ve had an incident where I was calling to a gobbler still in the tree only to have the gobbler fly to another tree closer to me. I had decoys out but he landed in such a way that he may not have been able to see them. He would gobble, crane his head down to look back under his feet in my direction, but refused to fly down. This went on for over an hour before he finally hit the ground. I did eventually take him but I’d never seen that behavior before.