If Heart, Chemistry and Desire were the main focus of GM's and winning teams we wouldn't be talking about ERA, FIP, Strikeouts, Batting average etc. because they would all be trumped by chemistry. If your premise is correct then all of baseball has it wrong. We shouldn't look for guy who throws 100 miles an hour but gritty guys with heart that throw 80. I am not aware of any organization that prizes such players. I don't think anyone would argue that chemistry makes a difference, and no one has that I can see, but the Talent has to be there to win. You can have the greatest chemistry in your locker room and never make it to the playoffs. You can have the talent of the Yankee's and not make it to the playoffs as injuries, down years, and poor decisions come into play as well. In the end the baseball world searches for talent first and chemistry later.