It’s very difficult to try and quantify that, especially more so in a sport like baseball. I tend to think the lack of Angels winning has more to do with both the production and the managing around him, rather than his ability to some how uplift the spirit of the team around him to play better. That’s something I feel like Skip Bayless would try and argue tbh
There’s no need for either of us to to get combative about a silly sports topic like this, I am always happy to agree to disagree before going that route 
 
		 
And Skip would be right my g. Look at all of the superstars from the 80s to now. Superstars had impact all around. The locker room, the chemistry, the confidence of the team and on winning. To me, this WAR, fWAR, Fangraphs shyt is nice to have but reality is, winners win. I say this as a nikka who I can watch a team, see how their mindset is and say they got it, they will be there at the end. When I watch the Stros. They got it. When I watch the Cubs when they won it all, they had it. Hayward wasn't even hitting for shyt. They just had the sauce. They knew it. They all had the swag. shyt, look at the Bronx Bombers over the last three years, they got it. They just ran into some better teams. Red Sox last year was clicking on all levels, no one was beating them. Stros and Dodgers was a tier above everyone two years ago, you just knew it was them winning it all. This year, it's the Yanks, Braves, Dodgers and Stros. You just know they got it. All of their players raise their levels. The locker room is on 10. The management don't even got to be great when you got the locker room, the chemistry, the superstar who makes everyone happy to come to the park like Altuve, Peterson, Acuna and Albies, Buxton and Palanco and Didi. Hell, the Yanks was fukking with Frazier because he was a bad fit in the locker room. 
You gotta have the locker room. People don't get it, but it was one of the biggest reasons why the Braves 90's dynasty lasted so long and Bobby didn't always get alone with guys. Deion and Kenny Lofton for example. shyt, Jermaine Dye too.