I don't think there is really two Tyrants. What CAPCOM did with this game was basically pulled a RE1/REmake style of campaign(In Jill's campaign Rebecca never appears/probably dead, same with Barry absence in Chris' campaign).so does X stich himself together after being skewered by Berkins or there's 2 of them? Because he loves Leon till the very end.
There is only one Mr.X, in Claire's campaign he gets killed by Birkin while in Leon's campaign he gets blasted by the Rocket Launcher. Notice that Annette dies in two different forms in both campaigns.