I did not have Everfast anywhere, but I do sometimes play horses on the switch to Rosario. It almost worked with Ulele in the Black-Eyed Susan (who I thought got pounded late). My sense is that Rosario's style (strong, lots of hands and heels) sometimes clicks with horses.

I echo the idea that the place to play a longshot in these big-name races is an exotic pool. Everfast was around 100-1 in both double pools that ended with the Preakness.