Why did Jess Jackson back Rachel Alexandra out of the Breeder's cup this year?

I would like to see her face Zenyatta. I'm not talking about a match race although i think we might see one again in the future. But i mean in the Distaff or Clic or which ever they're planning to run Zenyatta in this year. All i heard about Rachel is that she's not running in it this year. Will Jackson change his mind? I in no way support match races i think they're horrible look at Ruffian. She never broke down until the match race came. I think facing each other in a full field is much better.