I decided to go ahead and run the "Wipe" function from within TWRP, did the factory reset option. Looks good so far, everything was erased and wiped back to stock, out of the box. Once I saw this worked the way I hoped, I went back into TWRP and wiped my internal storage, so everything is cleared out now.
I do have a question: Would the phone still be rooted, or do I have to reroot it now?
If it's still rooted, do I just reinstall SuperSU and go from there?
Thanks in advance!