what the hell does that prove? and besides, a LOT of stuff from that novelization got thrown out the window. IN THE MOVIE, Vader STATES: OBI-WAN ONCE THOUGHT AS YOU DO. At some point in time, Obi-wan tried to get him back. The Jedi will always try to recover a lost member, even those lost to the Sith, it is there way. And you said his "injuries forever burned the dark side into him". And I said that i think the fight starts when obi-wan tries to get him back. BEFORE the injuries since they are a RESULT of the fight. There was hope before the fight. It is obvious that the talk doesn't go well since we already know the outcome. So once the injuries burn the darkside into him, then he is beyond hope. So there is still the matter of Obi-wan trying to get him back before the injuries as I pointed out.
In regards to Ventress: Palpatine knows the legends of Anakin being the possible Chosen One. He wanted to turn him after he knew of him. But he had to wait for him to get pushed a little more. That's why he fuels Anakin's ideals that the Jedi are too controling of him. "you don't need they're guidence, i see you being the greatest of all jedi, even more powerful than master yoda". And as we saw in ROJ, Palpatine sees into the future. He knew all about the rebel fleet. Everything always goes the way he has "forseen". That is also a Sith trait the Jedi, other than those as disciplined as Yoda, do not indulge for it is trying to control through the force, more of that setting the force off balance stuff. Ventress was already too set in her ways, she wasn't as accepting, and she is no where near as powerful as Anakin even now, let alone when he's Vader. That's why she's not considered. The Sith see her as a useful tool only. Dooku may have been trying to get her as an apprentice for himself, so he could kill Palpatine and take over, but Palpatine, in all his wisdom, probably already knows this. Not to mention that Dooku is getting scammed to, as soon as Palpatine has a chance to get Anakin, he'll drop Dooku. And, if you know the spoilers of the first 20 mins of III, you know all about that anyway.