And is this Third Force the Drakh for all intents and purposes, or the EA Shadow Tech Conspiracy?
There's no explanation in these particular notes who the "Third Force" is, and the Drakh are referenced in the same notes as "Z'ha'dum survivors" so I don't think they are intended to be the same. The notes imply that the Third Force first shows up when Sheridan's son appears.
[Ivanova] is among the first to encounter the Third Force out there. She is Sheridan's champion in meetings, in council, and on the battlefield.
Not sure what this means. With Ivanova absent from year five, I guess we'll never know...
There was a bit more on Ivanova in these notes:
Captain Ivanova divides her time between B5 and preparing to take command of the first of the Warlock class destroyers. Meanwhile she is given more day-to-day responsibilities
...
So that is likely why she ends up being one of the first to encounter the "Third Force" since she's checking out the Warlock class ship.