The mention of the Pope in the diptych did not really have a strong correlation to the attitude they had for Rome pre-schism.
According to the
Annales of Cardinal Baronius in the 16th century, the Emperor posed the question in 1089 as to why the Pope’s name was not mentioned, and was told:
Not by a synodical judgement and examination was the Roman church removed from communion with ours, but as it seems from our want of watchful care the Pope’s name was not commemorated in the holy diptychs.
That is one of the oddest assertions I have ever read here.
Whoever invented this explanation is trying to claim the deacons, priests and bishops of the Great Church in Constantinople (there were dozens, if not more than a hundred) simply
forgot to commemorate a patriarch !?! This is something they did and heard every day, like a litany.
“Oh … there was another one? … gee I forgot”
“I forgot too …”
It implies that the bishop of Rome was so far off of the minds of these people that it was like he never existed. That’s actually worse than disapproval, it suggests utter irrelevance. I don’t see how anyone could have believed that at the time.
I’m quoting the translation from George Every,
Misunderstandings Between East and West, whom I will go on to quote directly (p. 12):
Later Byzantine writers generally agreed that the commemoration of the Pope disappeared in the time of the Patriarch Sergius II (1000-19). In what may be the earliest notice of this we are told that the reason was not known, but “the quarrel was apparently over some sees.” …
Potentially could have been, but the Normans didn’t start to attack the Byzantine empire until around 1016AD and that was apparently a smaller scale ‘ruffian’ affair. The seizure of territories started in the 1020’s and the replacement of bishops would have been after that.
Most sources I have seen agree that the date was 1009, and that was the year that the filioque started to be used in Rome. Since the filioque had already been a flash point between eastern Catholics and western Catholics for multiple generations I don’t see any reason to doubt it.