While I'm pretty confident about John Constable, Sternrubin is probably the one I fear most, precisely because his curve might be one of the steepest in the race, apart from JC's.
However, going back to the Gerry Fielden [when Sternrubin beat JC], Sternrubin was allowed several lengths at the off and then allowed to increase his lead. The others clearly thought he'd gone too fast and John Constable was confidently ridden to beat the rest with the jockey assuming Sternrubin would stop coming up the straight. Good horses were strung out like washing that day yet JC had been allowed to drift out ridiculously in the betting. Obviously there wasn't a penny for him. I don't think it's unreasonable to assume they thought he wasn't 100% ready that day and I expect him to improve a good 10lbs for the race. That and a 9lbs pull (or whatever it is) with Sternrubin should really be more than enough to see him home in front.
I must go and watch the Gerry Feilden again on RUK but it is a fair point .