It doesn't seem that the RFM69 attached to the Mega2560 is getting the interrupt. Maybe the 3V3 is too close on my Mega2560 for an input. I tried two different RFM69s, both work same.
I did get the Node (on Mega2560) to Gateway (on Moteino) working (somewhat) by using "Send" instead of "SendWithRetry" and ignore the ACK back to the Mega2560. It gets sent by the Moteino but the Mega2560 side never gets it. Which is why I am suspecting interrupt level issues. When I load the Gateway code on the Mega2560 and Node (on Moteino and using "send"), it does not work at all as the Mega2560 is largely in "receive mode," which again points a finger (at least in my line of reasoning) towards the interrupt signal on the Mega2560.
I suppose the line itself could be dead, really shouldn't be but I've seen crazier things....
I'm still hunting... I could not get the 4.7K/10K divider to give any results which is why I switched to the 1K/2.2K divider..
I'm working on some other aspects of my coding endeavor (remote control of LED lights on reef/saltwater fish tank), while waiting for my level shifters to come in.