History is always provisional. But so far as I can see, even when historians do fairly civilised demolition jobs on each other's theories, which is not always or often,the result is rarely negotiated. I think the Curator's job is to make some sort of judgement on the current state of debate, which may take account of majority views of managers but should not be held up by any one of them. Of course I therefore think that Sharon is right in keeping deleted data and reasons why it has been deleted.
Genealogists tend to treat the historical records a bit differently from historians. There are several possible Agatha's around who could be kinswomen of "the" emperor (if it were in Latin it could be "an" emperor, in OE not). But:
(a) it is generally agreed that the bulk of manuscript D was compiled under Ealdred Archbishop of York and Bishop of Worcester (d.1069). (It contains a poem which is very much in Ealdred's style). More historians used to think it was compiled at Worcester than at York; but there are countervailing indications (it has no, or almost none, interest in Worcester under St Wulfstan of Worcester, the last Anglo-Saxon bishop in England) It continues after Aldred's death; the hand of the existing manuscript is late eleventh century or possibly very early twelfth century.
(b) Plummer put the date of copying the existing manuscript at around 1080 (on the understandable grounds that after Wulfstan's death it could not have been done in Worcester, and before his death the scribes there were very busy recording what they could of Anglo-Saxon secular as well as religious culture), As Whitelock and others have showed, there are strong reasons for believing that it was copied, with new information about Edward the Exile and his children, afterwards: the hagiographric detail about St Margaret of Scotland would not have been appropriate for a living person.
The natural meaning of the words in manuscript D is that having become a distinguished person in Hungary he married a kinswoman of the emperor who was Hungarian. Of course he could have married a kinswoman of the emperor who was Polish, German, or Kievian, and we can find Agathas there. But this is not the natural meaning of the words: we would have something like "he became so distinguished a person in Hungary that princes elsewhere sought a marriage connection, and he married a princess of ........ Her name was Agatha"
(c) Not only did he go to England from Hungary, but so did his children Eadward the Aetheling and Saint Margaret of Scotland - and their mother. If she was from anywhere outside Hungary, one would have expected her and the children to return to her birth-court, and for them to arrive in England from there.
(d) The evidence seems to me overwhelming that the currently existing manuscript D was copied probably from York rather than Worcester (not that it really matters), and commissioned by Eadward;s children or at latest grandchildren to show the importance of their line. Of course it is always possible - if highly unlikely - that Agatha was a peasant. But if we are to choose between kinswomen of the emperor, Agatha of Hungary must win hands down.
I am glad that we male genealogists have only a 3% chance of paternal (registered) ancestry being wrong. Oddly enough, Muslim funerals seem to call the deceased son/daughter of the mother, rather than the father, on the grounds that only this is certain; despite Islam being in my opinion a highly patriarchal religion in practice.