During the quest I love how Pantalone is insinsistent on Dottore's humanity. Dottore always viewed himself as a monster wearing human skin but Pantalone has seen all of Dottore. The good and the bad and despite all Dottore's evil deeds he sees Dottore for what he is. Human.
Omega being a segment of the original Dottore makes him feel more disconected from being a human. He says that he is Dottore. Not Zandik. Seperating himself from the original.
But clearly he still sees himself as Zandik. For example we see he signs using that name. He even admits he is Zandik at times. He sees himself as Zandik but he walks around fully admitting it. For him Zandik represents being human. He struggles with his humanity and identity just in a different way then the other Dottore's did.
But in the end when Dottore is dying Pantalone asks him what he would like to be called. Pantalone will use whatever name he wishes. Dottore gives Pantalone the choice and Dottore says goodbye using Pantalone's real name. He sees Pantalone as human so of course he uses his name and Pantalone as someone who sees Dottore as human uses his real name in response.
They see each other for who they truly are and they wanted to show that to each other. Thats why Pantalone gives him the choice.
And when Dottore is talking to Nahida he finally admits what none of the other Dottore's could and sturggled with. That he is human.
