Antepost I have Epatante 9/2, Abacadabras 10/1, Saint Roi 33/1 and 25/1, and Saldier at 25/1.
I think Epatante will win, and two of the other three will fill the places. Last season I backed Epatante too. I did that because I could no longer ignore the blindingly obvious. She was easily the most likely winner and therefore she was the value. I think the first time I backed her she was only 4/1, and I still backed her again on the day at 2/1.
This season, if I didn't have the antepost bet, and specifically the 9/2 about Epatante (plus several multis at that price and at 4/1), I'd be really hopeful that one of the others at a bigger price could bridge the gap because I'd want a viable bet. I certainly wouldn't be backing Epatante now in a single at 6/4, I'd want the each way value and I'd be backing Saint Roi, and probably Saldier. Those two and Abacadabras are the only ones that provide any kind of viable alternative. Everything else has already proven to be well short of her.
As a slight aside, is there a danger here of framing our thinking on the prices in the market rather than what we think will happen? I know I can be guilty of it. What I mean by that is, surely it's better to accept the obvious, that with her 7lb allowance it is highly unlikely that anything else will be good enough to beat her, and therefore any other bets are just playing for places.
If you haven't got her at early prices it's better to accept her price and use her for multis, and/or find horses pre-Festival to roll-up onto her to boost her price.
FWIW I've done both of those things and have the other three backed as alternatives with the place part running for me, or as huge prices if something happens to her. I think I've pretty much got the race covered, and if I don't have a good result from the race it'll be because of something genuinely left-field.