>>23581903
Spade Zeon remnants makes sense. Space is vast with plenty of hiding places, and lots of leftover old ships that can be renovated with new tech. They have secret logistics support from Anaheim Electronics or Neo Zeon groups.
But Earth-based Zeon remnants make no sense. Earth has only a limited amount of places they could realistically hide with mobile suits. The oceans make no sense because even submarines need a home base to dock and make repairs. The Federation will know about it. Deserts are pointless because nothing is there and sand will mess up mobile suits. Plus lack of food and water. Plus to travel inland, you need air transport which Zeon remnants doesn't have. Who would pay for supplies like food, water, and spare parts for mobile suits? Where are they getting money?
I prefer what Tomino said. That Zeon remnants on Earth all died off in ZZ Gundam. And Char's Neo Zeon was the final last gasp of Zeon in space. 10 to 12 years after the one year war is the limit I think for even the most dedicated die hard soldiers.
Unicorn is already pushing 20 years After the OYW. No way an army stays together that long for no leadership, supplies, or weapons.