Wagering format
 

Derby day, will they have an all stakes pk 4 or will the last race be in it? How many pk4s will be offered Derby Day?

Without seeing the fields for the other stakes involved, I still think it's worth taking a shot at the pick 4.

With the derby being the final leg, it's a useful hedge bet if you're still alive after the first 3 legs.
It simplifies your derby exotic wagers, knowing that you have horses who are already covered in your pk 4 ticket.

I assume Baffert will have Pussycat Doll ready for the Humana Distaff, which could be a single.