>>13401064>>13401375The two aren't incompatible at all, and in fact they reflect the whole theme that MGSV is about.
Big Boss made himself into an ideal rather than just a person. This is how he completed his transformation into a villain, by making other soldiers into his tools just like the very people that he hated, but it also meant that the soldiers who follow the ideal of "Big Boss" no longer necessarily follow Big Boss the person.
Ocelot is the product of that: someone willing to betray the individual for the sake of how he interprets the ideal. His devotion to the ideal is so great that he's willing to go against the very person he respects if he thinks they're in his way. And because the two are separate yet inextricably tied together, Ocelot doesn't think he's betraying Big Boss at all.