I'm just glad I can help out. I've been blessed to ask the right people the right questions at the right time to get the little hints I need. I'm very happy to pass on that help to anyone I can. I've been beating my head against Zachariah for so long I didn't even think to check his children!
You are correct, re Warren M Ellis. His middle name is Madison. His son, with Julia Kemp, is Warren Preston Ellis. So the tombstone was correct & I just got a little confused.
I sent you an invite, to your Gmail account, to view the family tree so you can see what I've managed to piece together & the various source data. Feel free to have a dig around, let me know if anything needs correcting. Welcome to the extended family. ;)