This race is Definitly a bookies race at the moment
If you can predict the King George winner, you've got the Gold Cup SP fav IMO.
Only an impressive win from Yorkhill could usurp the KG winner as fav for me (even an Our Duke big win might not convince bookies).
For me, Might Bite will be fav although how the market reacts will depend on the manner of any winner. If it looks as deep a race as it is now though it'll be a really strong looking winner on paper!
You could make a case for MB 14/1 for KG/GC in my opinion as he'll be similar price to thistlecrack was (5/2) after the KG?