If he tags Suzuki and then gets the force at 1B, it doesn't matter when Espinosa crosses home, because it is a force at 1B. The 6 4 3 was possible, but not easy with his momentum going the other way and the hesitation. He needed to come home first. With that out of the mix, the DP was the only option. A 4-3 DP could have worked if Suzuki was taggable, but the 6-4-3 was the best option left. Unfortunately, you have to either go home first or start that DP first, you can't change your mind and have time to pull it off.
After watching the replay several times, I think once Uggla bobbles the ball AND Suzuki alertly holds up, the play was over. The slight bobble made the play to the plate impossible and also made the 4-6-3 DP highly unlikely. That ball was not hit as hard as I thought while watching it live and I think Tracy easily would beat the throw back from SS trying to complete the DP.
Just great base running (or lack thereof) by Suzuki on that play.