It's not TAA's fault that Southgate waited until the finals of a major tournament to experiment with him in central midfield for England. Whether or not he's an international-level central midfielder, you can't just chuck him in there like that. The whole thing smacked more than a little of Southgate trying, yet again, to shoehorn his best players onto the pitch rather than picking guys in the correct positions to give the best team rather than the best individuals.
Once Walker retires (surely any second now), TAA will get that RB spot and if he plays his cards right, should nail it down for the next three tournament cycles at least.