You can't
be a "good alpha" - You're either a naturally dominant personality or you're not. You must be the type of person to take offense to the notion of another person being bigger or badder than you, as this is the motivating factor that pushes you to want to out duel the opponent.
If I had to pick one guy on the team that seemingly possesses the alpha gene, but just lacks the confidence.. I'd have to say it's Murray. You can see it in his mannerisms and his swag.. he looks straight into the camera when interviewed, appears to enjoy being center of attention judging by his social media presence.. he's vocal in timeouts seemingly "stepping on Pop's toes" and coaching his older teammates at 21 years old.. He's got the supermodel girlfriend which definitely helps, TP is no longer ahead of him, and it's 100% clear the keys have been handed to him. He now needs to assert himself against the premier guards in the NBA offensively and defensively. I think this is the year for him to prove it.
It took Parker like 3-4 years to finally realize it.. I can remember Stephon Marbury dominating his ass and turning him into a shadow of the player he was every time we played PHX, but he finally figured it out