Let is make something clear, Kevin always had been a mutant in OS he was a mutant and that was the best series, because they begin all, later in AF he become this strange rebooted alien guy that have a family that came out of knowhere and in UA Dwayne McDuffie put "more money in the table" and begin to play to the chances making all kind of character to talk about Osmos V, Azmuth, Paradox, Ben, Kevin all this to create again a Mad Kevin thanks to Agreggor.
Now in Omniverse they try to be good with the fans, they dont want to make the same thing that AF make to the OS fans, change, destroy and create things of knowhere.
So they choose to explain in 3 episodes the 3 biggest fails in all the plot holes that Dwayne McDuffie left behind in his scripts, The Plumber Kids, Devin Levin, Ragnarok, the past of Kevin and of course why he is or not is a Mutant.
We have then create the Rooters and the cool thing is that they event dont destroy all the past, the events of UA still happens, Kevin was trap in a Null Void jail, how he get out of his Monster OS Form and later he is free in the Null Void, but is trap there you know?
Then is where the evens with Arggit and Otto happens and finally later of that is when the Rooters take th kid that escapes of Jail.
All is really well explain, about AF they dont destroy too the past of AF, until now we know that Devin Levin is the father of Kevin, but he wasnt the parnert of Max or even a Osmosian. Ragnarok maybe could be only the same villain that we see and he dont even have to be a Rooter because he could be only a guy in one of the case of Devin that in later case kill him and later Proctor put the memories of Max like he was there you know?
About the Amalgam Kids, is nice to see Helen with blue hair and understand how they create this mix and why?
But lately i am sure that Kevin is not a bad guy he would make a sacrifice that is sure, Proctor will make Kevin make a sacrifice is him or the Amalgam Kids...