So for the West Indies I can open with Weekes because he can't find a place in the middle order. He was an opener, if he makes the team he should open. There has to be some rules, other wise in makes a mockery of the exercise.
Also from a strategic perspective having Sutcliffe and Hutton batting together is not what any team wants after loosing their first wicket. Your number three batsman is your best (or second best) batsman who can adapt to any circumstace and attack when required and is a specialist batting position.
Additionally Sutcliffe averaged more than Hobbs and Hutton and still not seen as better than either, it's because he was a very slow scorer and Hobbs had the ability to make anyone who opened with him better. Hutton and Hobbs were true number one openers, while Sutcliffe was a number two, a great number two, but he was a number two.