DEAUVILLE, France—The more things change, the more they stay the same or, as our French friends here in Deauville would say, plus ça change. Sheikh Mohammed buying the top lot by Dubawi (Ire) at a yearling sale is not exactly a surprise, but it is also not a situation that could have been taken for granted ahead of a sales season shrouded by uncertainty. The elite end of the yearling sales market stuttered into action on Wednesday at Arqana, where vendors' pre-sale jitters appeared to be justified through the first...