Randy Orton goes to...
...Suzuki Gun
The best version of Randy Orton is the psychotic and ruthless heel he portrayed when he led the Legacy trio in WWE, from 2008-2009. That is the Orton that New Japan will get when they take him away from WWE.
A top AEW star just called one of his colleagues 'spoiled' and 'narcissistic' HERE.
As such, he'd be at his absolute best in this version if he were to join the equally crazy Suzuki Gun. The major question that remains is if Orton would be willing to follow orders?
It takes a strong persona like Triple H to reign in somebody like Randy Orton and even then he couldn't do it too easily. To see this version of Orton flourish under the leadership, there needs to be someone who can keep the occasional leash on him.
Unfortunately, Minoru Suzuki is not that guy. Though he'll command great loyalty from Orton, he will let him ruthlessly hunt as he sees fit. Suzuki will have to be just a tad bit careful then, to make sure The Viper doesn't strike him.