I'm all-in on Defi.
As I alluded to in last season's Novice Hurdler thread, he is no ordinary juvenile, and a handicap-mark of 157 looks on the lenient side. The only time the words "impressive", "easily", "very readily", "not extended" or "comfortably" were missing from Defi's race comments last season, were those after the Triumph Hurdle, where it simply stated "ran on strongly to go clear". This horse hasn't stopped improving yet.
I agree that he will need to run to a higher-mark than 157 to win this - the question is whether or not he is capable of doing so.
First of all, he needs to run his race, and I've no concerns whatsoever on that front. He is as genuine as they come, seems to thrive for being on the racecourse, and has a very straight-forward and mature attitude, given his age.
As far as fitness is concerned, I can't imagine Hobbs would send Defi here in any way under-cooked. It is a tough enough race for a juvenile, let alone one being asked to cart near-enough top-weight, for the first time against experienced handicappers. He wouldn't want to risk souring the horse, I don't think, and I expect him to be match-ready. There are absolutely no worries about the trip, track or ground, and with a fast-pace assured, he will get the kind of hold-up ride he wants.
The positives far out-weigh the negatives for me, and whilst I missed the price (figured he was a cert to be kept back for the Bula), I went in last night at 6/1. He has everything in his favour, and it will be a major disappointment if he doesn't win.