Very good issue, and lookin' very good!
I didn't think Mark needed to be so mad at Allen, especially since Oliver knowing about Thragg's attack actually led to his very own daughter's life being saved. It led to Oliver's death, but it saved his daughter... but I see how in trying times people who shouldn't be fighting may end up fighting. (And of course later on, we find out that Mark has more than enough reason to be mad at Allen, though he doesn't know this)
I was tripping on the fight against Allen too. Then, I saw him confess what Invincible's suspicions to be true, but worse!! And it's like Allen might die now. The last panels plus him on the next issue's cover gave that feeling.
I hope not though. His character reminds me of Dwayne 'The Rock' Johnson too. Now I can see the goodness. Sunder the Morlock in X-Men was like that.
Beautiful background sci fi art too. Ottley's pencils, and inks are tight. I wonder what comic he'll draw next after Invincible is all through. Lol