No Yelich? 26 HRs and 87 RBIs leads the team by 9 and 20, respectively.. Lots of people on this board have observed that when he's hitting, MKE wins. He's also a leader in the dugout. Ok, so he doesn't play defense much, and he does go into funks where he Ks a lot.
Others have weaknesses too.
Contreras may be the most irreplaceable player with only stopgap-type players behind him, but he went for a long chunk of this season where people wanted him to go on the IL due to his lack of production.
The Brewers have actually thrived without Chourio, so, while valuable, not most valuable
Turang, Frelick, and Collins are all really similar to me - scrappy do-everythings, but more like important cogs in the machine rather than the guy at the top of the opponent's scouting report.
Peralta is great, but often inefficient, putting a strain on the bullpen with his short, but effective outings.
It's Yelich for me.