Could Omni Man conquer the MCU’s Earth?

The question is essentially, can Omni Man arrive on Earth, join a superhero team (let’s say, the Avengers), go undetected for a certain amount of time, and then betray the Avengers and eventually take over the planet?

Let’s say, the situation in the MCU when Nolan arrives is how it is just before Thanos arrives in Infinity War, but Thanos never arrives.