The two really look nothing alike, and considering how sparse anime characters are in terms of facial features that's saying a lot.
While it was fun to speculate on the repercussions of Kaworu being related to Gendo, I must agree with Reichu's reality check. While I do believe Kaworu's DNA is acquired from another character, a much more likely candidate would be Keel Lorenz
(We do know he exists, because during Kaworu's conversation with one of the SEELE members at the end of 1.0, this voice was identified as Keel's in the end credits. But we won't know about any physical resemblance between Keel and Kaworu until he actually makes a physical appearance in the Rebuild continuity.)
I want to see Gendo fail, and not just to fail at the end, but in the steps before as well.
An all-seeing Gendo kills the immersion.
I somewhat disagree. I want to see Gendo fail at the steps before reaching his final goal, but I want him to reach his final goal. After all, what point is there in having Gendo pursue his own agenda independent from SEELE, if his agenda is never a serious contender for the final outcome?
No, I am actually rooting for Gendo's plan to succeed
. And I am hoping that, despite Gendo's ruthless methods, the goal he has been working towards will actually be a very altruistic, desirable situation.
Additionally, what I am also hoping is that, after
Gendo has overcome all obstacles, he will somehow come to the realization (through some involvement by Rei and/or Shinji) that his about-to-be-realized-ideal-world is inferior to a reality-where-things-can-still-go-wrong, and he will sabotage his own plan as a result.
Preferably by voluntarily having a contact experiment with Unit-01, so he can join Yui in its core for the rest of eternity.
I am all for the characters overcoming their flaws, and a scenario like this would seem like a worthy end for the likes of Gendo, i.e. he "runs away" towards Yui, but he leaves the world intact for Shinji.