The meta crisis doctor is fully human as far as we know. When he and Rose were left in the alternate universe, it was made clear that he would age and die along with Rose. This means that he could not regenerate. Thus, the fugitive doctor could not be a regeneration of the meta crisis doctor.
What if the new master is contemporary with the Martin Doctor. That is that he is pre Roger Delgado. This episode certainly raises the possibility that regenerations of the Doctor existed before Hartnell. Why not for the Master before Delgado. This master certainly implied that the Time Lords had hidden something related to the timeless child and made sure that no one remembered it. So, whatever happened to cause our Doctor to forget, a mind wipe or something else, must have happened to the Master as well. This was not a small scale operation. This new Master did say they lied to all of us, implying that this was not an event local to the Doctor.
If this new master is before Delgado, it preserves Missy’s timeline. It also preserves everything we know about the Master to this point. I can see this Master, post mind wipe, finding Gallifry where it had been hidden and discovering the secret of the timeless child and planning how to intersect with the Doctor leading to the events in Spyfall where the first Doctor he finds is JW.
It seems to me that the Martin Doctor must exist from a time before Hartnell. Something happened related to the timeless child that required it be buried or the Time Lords would be destroyed. There was no choice but to do mass mind wipe to get rid of all trace of the the timeless child. Perhaps this process resulted in some forced regenerations and new cycles. William Hartnell’s Doctor was the first of this reset cycle. After all, if a mind wiped time lord was near the end of his regenerations pre mind wipe and then though he/she was the first, it would be quite suspicious such a time lord were to die when they were supposed to have a bunch more regenerations. Let’s not forget the Doctor 1 must have spent a lot of time on Galifray. After all, he left with his granddaughter as far as we know. This means he had a life on Galifray. He must have had a mate and a child who would have been Susan’s parent, unless that is all part of the big lie. In any case, having this new Doctor exist anywhere than prior to Hartnell would just create some huge issues that would not be easy to make right with Doctor’s history as we know it.
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