All 3 broke perfect and were 1,2,3 the entire race so all 3 had perfect trips. Dortmund just couldn't get the distance because he didn't go that fast but still tired. He might be better at the shorter Preakness distance. AP and Firing Line are pretty equal horses at this stage with only the slightest of edge to AP since he won the Derby.
If the field I posted above does run( I got the info off DRF so I considered it pretty accurate) it should a very good race. The interesting horse for me will be Materiality, who got a poor break in the Derby and stuck on the rail behind a wall of horses at the start and was 12 lengths back at first call. However, he worked his way thru to finish 6th, just 7 lengths back and had one of the faster closing times for final 1/4. If he gets a good break in Preakness and is in the battle up front also, it could make things interesting.
For AP to win the Triple Crown, I think he will need to be a great horse. Only time will tell if he is.