@max384, you're exactly right. I think I'm dealing with the original reason why the bike wouldn't fire in the first place. Like 99% of the threads on a bike that won't start, I went with a battery check and charge, and fuel pump, you know, the old Air-Fuel-Spark trifecta.
The battery reinstall snafu scorched the 30A fuse*. After I replaced it, it now was back to what was the problem in the first place, that's why I pulled the plug, to see if it was throwing a spark when I cranked the bike.
The plug looks good, it's just not throwing a spark when I crank the ignition.
*Correcting an earlier post. There aren't two 30A fuses at the starter relay, the one you can easily see is the spare, and the hidden one is the functional one. Nice engineering KTM.