Another factor is the dialog at the beginning of WC2--Blair comes into the Concordia RecRoom to find Hobbes, Angel, Spirit, Doomsday, and Jazz, and comments that they are the survivors of the Tiger's Claw, and that he didn't realize there were so many of them left. Doomsday then chimes in that all they need is Paladin and Maniac, and they can all die together.
This implies that at the time Doomsday at least thinks that Knight (and, for that matter, Hunter, Iceman, AND Hawk) are all dead, although the novels indicate that Hunter, at least, is still alive at that point, and we know that Hawk is. That line of dialog and how it doesn't jive with later additions to the story by the novels and by Prophecy always bugged me.
Then again, it's possible that Doomsday only meant surviving PILOTS of the 'Claw, and, if I recall correctly, Hawk hadn't been a pilot at the time he served on the 'Claw, so maybe Doomsday wasn't counting him. Or maybe Doomsday was only counting survivors of the Claw that he had personally known...
Iceman is the most interesting case. We know he bought it when both Blair AND Hawk were flying...because he told Casey that Iceman agreed to be his wingman after he lost a buddy, and because he said that Blair flew out and recovered Iceman's body. That could have happened on the 'Claw, of course, but that would contradict Doomsday's statements above (had Hawk been flying with Blair and Iceman at the time, Doomsday probably would have included him as a "survivor of the Tiger's Claw"), and other sources that say Hawk never was a pilot on the Claw. But shortly after the 'Claw was destroyed, Blair was demoted, transferred to the ISS and Caernarvon, and didn't fly a combat mission in "ten years". So the only conclusion I can come to is that Hawk started flying immediately after the 'Claw went down, and that Iceman flew with him, bought it, and had his body recovered by Blair while they were all on the Austin escaping from K'Tithrak Mang before Blair's trial.
Of course, it's also possible that Doomsday just thought Hawk and Hunter were already dead...maybe they were on deep recon or special ops and had been missing from the mainstream picture for a while. But everything taken together, it's likely that Knight was indeed dead by the time WC2 starts.