Dark Angels Organizational History

I don't know to what extent this interests members of this forum. Personally, I've been curious to what extent one could piece together the main characters of the Dark Angels Chapter. I spent some time perusing through the various Codices, novels, and articles published by Games Workshop and Black Library.

Obviously not everything matches up neatly. To make all the news reconcile, one has to come up with a neat reason as to how no less than five (!) Company Masters of the Dark Angels presumably met their end sometime between 997.M41 and 999.M41 (four of those positions actually change name in 999.M41).

There are also two issues that I didn't try to reconcile:

1. Codex: Angels of Vengeance shows the three Battle Company Banners and references them to Company Master Belial, Company Master Sheol, and Company Master Sammael, respectively. Sheol can be managed in, but Sammael's history has clearly been changed in the intervening years. His progression to Grand Master of the Ravenwing not only makes no mention of him being Company Master of the Fifth, but specifically qualifies he came to the Second Company as a Sergeant.

2. Warlords of the Dark Millennium - Asmodai makes mention of a Company Master Charon... but does not mention which company he leads. Rather than guess, I have chosen to omit poor Charon. I'll make an attempt to reach out to Gav Thorpe and see if he wants to give poor Charon a home, though. Stay posted, I suppose!

Note, this is NOT a chronological chart. It's impossible (I think) to accomplish this for the Dark Angels, as the lore provides specific dates for only a few individuals. Thus, this table merely aims to show which officers occupied the known major offices of the Dark Angels Chapter, as far back as 897.M41. Prior to this date, the line of succession is not clear enough; names and specific dates are not provided.

Legend:
A red block indicates a known death. A gray block indicates someone who has been replaced in that office, but whose fate is unknown to us.

[C:DA] Codex: Dark Angels
[DV] Dark Vengeance
[MoS] Master of Sanctity
[TPoK] The Purging of Kadillus
[TU] The Unforgiven
[WotDM - A] Warlords of the Dark Millennium - Azrael
[WotDM - B] Warlords of the Dark Millennium - Belial
[WotDM - E] Warlords of the Dark Millennium - Ezekiel

If you can think of any that I have missed, please let me know!