Interestingly, Fifteen has quietly explained.
Theending of theDoctor Who60th anniversary specialswas one of the biggest moments in the show’s substantial history.
The implication is that when Fourteen regenerates, he’ll become Gatwa’s version.
“I’m fine because you fixed yourself.
We’re Time Lords.
We’re doing rehab out of order.”
Custom Image by Daniel Bibby
Otherwise, there would be two versions of Gatwa’s Doctor in existence simultaneously.
It could be after Donna Noble has long since passed, or it could be much sooner than that.
Regardless,the process of what the Fourteenth Doctor’s regeneration process could look like is fascinating.
The latest Doctor Who series introduces the Fifteenth Doctor, joined by new companion Ruby Sunday.
Without a Doctor to guard it, this could certainly happen.
Of course, both TARDISes could also recombine.
However, chances are slim.
With the Toymaker long gone, his powers will have dispersed.
Doctor Who’s main character clearly has a high threshold for tolerating emotional trauma.
Alternatively, it’s just been buried for an impossible amount of time.
Either way,the Fourteenth Doctor is the breaking point for how much he is able to shoulder alone.