Malakai was awesome, and quickly came to the conclusion of what was wrong while I power cycled again, and he cleared our table so I'm glad it's still at just one. In our haste, Malakai and I didn't check which MAC addresses were filing up our table before he cleared, but our router should have always been on the table and somehow it got bumped off, causing the problem.
Good info on the LAN complication. I had to have our MAC table cleared back in 2019 or 2018; I forget exactly, but that was one of the reasons prompting me to look at the forums here and posting. We redesigned our network since then and have only had this new Netgear since our April before our older Netgear plugged into the ONT via the WAN/Internet ports. I'll admit that in the middle of my hour of late night troubleshooting I did change which port the Netgear uses for internet and can't honestly remember if I did that in the settings before or after moving the physical cable, but this was long after getting no handshake with Sonic.
Again, overall love Sonic and appreciate the support. I will never do a network/firmware upgrade outside of support hours again.