If I were 100% sure I'd try, however, I am not. Since I think he's trying to twist an ambiguous sentence to mean that she is somehow moving on and leaving Lelouch behind. Which doesn't make much sense to me at all.
Greetings, citizens of the world, the Holy Kalulu Empire declares that it will no longer tolerate the attacks on the sacred truth of Kalulu. Since the beginning of the Second Era, the Messiah, Lelouch Vi Britannia, has been constantly connected with the Red Lotus. Although circumstances has managed to constantly prevent their unificiation. However, with the final fall of wings, we have seen how the Spirit and the Messiah has been able to overcome the obstacles.
Heretic have said that the emotionless face of the Messiah truely shows that he does not care for the Spirit. However, this is certainly a denial of truth, for the Messiah is going down the path to hell, and does not wish to bring his beloved with him. Even the so-called Matriarch acknowledges how the Messiah behaves, in the sacred records od Stage 15.631:
C.C.: He (Zero/Lelouch) won't involve the women who are truly important to him. In other words, I am completely out of his consideration.
The Messiah is kind, the Messiah is caring, the Messiah is not willing to let those that he loves down the path of destruction which he will go to save the world. Even if the Holy Spirit tried to hang on to the Messiah, the Messiah will continue on, leaving the Spirit in safety. That is the objective of the Zero Requiem: by destroying himself and his Disciple, the Knight of Zero, the Messiah will bring peace to the world, by being the Demon. Those who do not believe in the pure spirit of the Messiah, and follows the corrupted Matriarch, are going on the false way. Only the belief of love, only the belief of hope, only the belief of sacrifice will show the true light.
Therefore, we the Holy Kalulu Empire, hereby declares war upon the heretics of the United Federation of C.C., and will go on to victory. Do not let the lies of the world blind you, do not let the false light lead you down the wrong path. There is only one truth, the truth of Kalulu, and we will march to victory for our faith.
Well, I agree with everything you said, as such I'll move the discussion to the very last sentence.
What I see happening is one of three possibilities:
-Kallen sacrifices herself to save Nunally and stop Schneizel.(You actually have possible foreshadowing of the SEITEN's demise in Ep.21 when Kallen muses about being unable to move on just as the SEITEN appears from behind the doors with light washing over it.) Not sure how her gum line would play into this, possibly as she's dieing in front of Lelouch.
-Lelouch allows himself to be killed either by Kallen or just anyone, she finds him and he dies in her arms.
-They both survive...
Knowing that there is a reoccuring motif of karmic justice, or perhaps injustice, for Lelouch the ultimate payment for his actions wouldn't be death, but more Kallen's. He's done everything to keep her alive, and in the end, he gets her killed.
I like your analysis, though, I suppose, I should play devils advocate and ask what is stopping her from moving past him, even if they both survive. Certainly, assuming any of her character development was for some actual purpose, one would expect her to see past this one last mask of Lelouch. To go back and get her answer when everything is said and done. But, assuming that all that development was actually about gerbils, what stops her, really, from just leaving?
This next episode, to me, seems like its going to be Gino and Kallen finding out what they really are supposed to do. (And I'll stick forks into my eyes if anything happens between them.) I don't expect them to join Suzaku and Lelouch, I expect them to play some third party hand that does save them in the end, though.
And to be fair, I can't see both Kallen and Lelouch walking out of this alive. I'm seriously expecting one of them to die in the other's hands.