I did say seems to be It was the same question I asked Kitz and that was the observation at that time.
I cant recall saying it was... I can recall saying it wasn't alphabetical. In days of old they used to upgrade the larger exchanges first when it came to physical upgrading of equipment. With FTTC, although on a small exchange, your cab's Head end often resides at a much larger exchange... many of which also have a MSE bRAS now.
I've no idea how they decide for G.INP, which is a two stage process 1)The cab upgrade 2)Roll out the DLM profile to the EU. Neither of these require physical intervention as they are software config related and carried out remotely.
If there is a logical pattern I dont think we have found out what it was. Stage 2) may even be something line specific.. because we know that all the cabs have been upgraded before they start stage 2.