Anything is possible, even the toughest warriors are all human... & even more so when they are way past it & become more like us normal citizens than world class fighters. With that said, highly unlikely, Morales is extremely proud & Garcia isn`t even close to Morales in terms of greatness & never will be, it would take a fellow great with more left physically than Morales for any chance of that happening... but even then they would probably have to weight drain him to make that possible
If he doesn't respect Morales, in the first fight he was hesitant early to mid but in the end he was bring the pain, I think he can but never count Morales out.
Garcia needs a high activity output to have Morales quit on himself. Very plausible at this point of the old man's career. Garcia doesn't necessarily need to hurt Morales. Keep the fight moving without many breaks and without over thinking things and Morales' body will be forced to give up. I don't think that will happen though. Morales knows how to slow opponents down. Always has.
I don't see it happening.. A lot of things would have to be wrong for Morales to get stopped in my opinion.
