How nice to be able to say: we don't need any more centre backs! But we don't. Soutar and Lindsay are really unlucky to miss out. And McRorie and Bates will be candidates 'fore too long so no need to look at a 27 year old.
The real question is: are we going for a back 3? If yes, then the key requirements are to be able to build up from the back and to have decent pace. So that would seem to suggest Hendry, McKenna and Tierney. Only problem with the latter may be a relative lack of height at 5' 10". Distribution is Souttar's strength, not sure about Lindsay. Berra' s distribution is not great which is maybe why he was overlooked, yet he could be a candidate for the player of the year! Good times. Wish we had this depth at right wing back.