GOODWOOD, UK--The banner on Trundle Hill overlooking Goodwood read, 'Thank You Stradivarius'. Inside the racecourse the message was repeated on branded flags, readied to wave him on his way. But it would seem that Stradivarius is not for retiring. And hurrah to that. It is almost poetic, in a bloodstock kinda way, that two of the best horses of the modern era, Derby-winning half-brothers no less, should feature in an epic battle between their two sons for a race that was so much more than just the Goodwood Cup. For...