Del Mar Race 3 8/10

[LITF]

Just curious as to why the 8 was bet down from the morning line of 20-1 to 5-1? And how in the world he ran so well when his form didn't suggest anything of the sort. I bet the race pretty hard and couldn't fathom a scenario in which the 8 won. It was his second start after being gelded, is that at thing? Other than that I can't see any reason for the horse to run the way he did and, more importantly, to have been bet the way he was. I've looked at it for like the last hour to try and find my mistake (usually my error is pretty glaring) but in this case I just can't seem to come up with anything. It knocked me out of the Pick 4 and 5. I had the 10 too, in my Pick 5, to add injury to insult. And it's driving me mad trying to figure out what I missed other than something I couldn't have missed.