that whole arc was incredibly filled with plot convenience. Robot conevneient manages to make a conveniently powerful enough army of drones covneniently large enough to conveniently kill most of earth’s heroes and villains alike, while conveniently Cecil does realize it till his throat is slit, while conveniently also cecil not having a back up of himself or a actionable plan despite bieng one of the most prepared mofos in comics otherwise, while conveniently all the robots have super nukes installed. And conveniently, Omniman decides not to destroy the robot army and prevent earth from falling udner another tyrannical force that is probably be like a mirror to his own actions on earth beforehand, and conveniently Mark doesn’t just… kill him in person.
I am not necessarily saying i am against the whole concept. I am against that he actually won and lived. Cause there is too much against him for him to succeed.
Cecil I’ll grant probably would have seen it coming but…
They show him building the army in panels leading up to the take over. He has his a mechanical moon base by this point.
Because Omni-man believes that sometimes weaker species benefit from being controlled by someone strong. It’s not “convenient,” it drives a wedge between Mark and his Dad enough that Mark leaves the Earth. It’s to show however much “Redeemed” Omni-man is, some of the Viltrumite programing is still baked into him by this point in his life.
Mark tries, and gets overwhelmed by the new upgraded drones before he can get ahold of his body.
The “upgraded” drone model is a little bit of an ass-pull but is still within the realm of believability for Robot’s character to be able to design and manufacture. He was also relatively useless against all other Viltrumite-Level threats previously so it stands to reason that Robot has been developing armor that can fight Viltrumites for some time.