When the trailers for Invincible Season 2 teased Omni-Man's return, fans were curious to find out how he would figure into Mark Grayson's life again. He seemed quite antagonistic, playing into the concept of an evil Nolan who almost beat his son to death before fleeing Earth. Nolan was seen as a traitor, so loyalists wanted to learn how he was dealing with that big paradigm shift.
Source:https://www.cbr.com/invincible-season2-fixes-omni-man-redemption/