Firstly it would be a rarity for a 10 year old to win this. One horse since 1930 has won this aged older than 9,and that was back in 1986. Therefore the current third and fourth favourites Rocksana and Sire De Berlais can be struck off as potential winners. Champ too if they're thinking hurdles is a better option than fences.
Horses having been beaten in previous editions also have a terrible record. So strike off all of this seasons also rans.
Currently we don't know any trainer that has come out and said any of the decent novice hurdlers are staying over hurdles Plus I'm not sure I can pinpoint a horse that i'd like to see stay over hurdles to target this, with one exception.
That leaves us with Flooring Porter 6/1, Thyme Hill 8/1, and Abacadabras 25/1 stepping up as he surely must, as potential winners. Anything else is coming from left field such as Saxon Warrior's suggestion Cape Gentleman 66/1. The other one I'd like to put forward at a price is Bear Ghylls 33/1. He was as green as anything this season and still ran a good race in the Ballymore behind Bob Ollinger, but some schooling and a step up in trip would make him a genuine contender for this in my opinion.
Outside of that, it will take a Flooring Porter type horse, essentially a horse that comes from absolutely nowhere, or a novice expected to go over fences not doing so, for the winner not to come from those four or five I think.