Imallin,
When you are MUCH the best going in, you take command, thats why they wanted BB in front.D\'Tara never showed the same kind of speed that BB displayed, for example, the Fla Derby clearing from the 12 post.
He broke well enough to make the lead, but Desormeaux took hold as soon as he saw D\'Tara. If he made the lead easily he still would have been off the board, imo. Having found no infirmiry/sickness, one has to assume he was over the top or if you believe several trainers,Billy Turner, Lukas, he was undertrained.
The horse was empty, period, the poor/panicked ride irrelevant.
Mike