A few things to clarify
- we'd never need to see DT again to follow 14's timeline
- it wouldn't retcon Ncuti because 15 and his timeline still exists and is completely equal
- bigeneration is ambiguous, with various contradictions, and we don't know that 14 will become 15
Waitβ¦β¦β¦
I think I have just realised a way that they could maintain the showβs continuity if they wanted to, whilst never needing to revisit what happens with Billieβs characterβ¦..π
Why donβt we follow the timeline from the 14th Doctor?