He's played CB the majority of the season, so no surprise he looks a bit rusty in there. He's also being asked to do too much, when he's put next to someone like Livermore, or someone who had such an awful game like Ox, he has to try and dictate things and that shouldn't be his game.
I wouldn't say he's really progressed this year, but he is still a good talent, so versatile, and with a proper partner does an excellent job holding, and getting us moving. Southgate's biggest problem is that he's without Hugo, Toby, Jan, Eriksen and Dembele.