Good players, solid guys ... Beltran (I disagree with signing him for baseball reasons) has been on a lot of good teams. He has had a lot of postseason experience, and whatever sample size that is, he has done well. I know you questioned his loyalty, because he had the temerity to go seek a living and take advantage of his free agency rights, but that is severely misreading what a professional is.
Team spirit and chemistry are important, but the first thing is good baseball players and (as much as you can control) healthy ones. You can't lead from the training table, and any amount of good team spirit can be crushed by a bad losing streak. Now can the team spirit overcome the crushing injuries the way the 89-73 2010 squad did? Or will it collpase like it did in 2012. That is a matter of leadership - and Farrell has shown that unlike the guy who ran the ship in 2012, he is at least engaged.