You cannot simply compare the individual players: it is a team that wins or loses, and every team is something different from a sum of its parts.
More specifically:
1. Scoring in the crunch time at the end of the games: whatever we think about Al and Millsap (when on fire) they could score when needed. Even Mo with his hero ball was passable at that. I am really not so sure that Favors, Kanter or Hayward could do so at this stage in their careers.
2. Experience. Al, Millsap and Mo played many times against all starters at their positions in the NBA. They know their bags of tricks, they know where they struggle against each of them and how to compensate for their weaknesses. Kanter, Burks, and Burke will still have to go through the painful discovery process.
3. Leadership. Who are the leaders on the new Jazz team? Hayward, Favors, Burke? The leader or two will eventually emerge, but the Jazz will struggle mightily until then.
4. The ever point-guard oriented Jazz will have to rely on the guy who is new to the team and even to the NBA.
And so on...