Burn? Not at left back for me. He was repeatedly beaten by wingers that season, to the point where it started to look cruel to keep putting him out there. At CB yeah, he's a solid option.
It wasn't his ideal position, but in terms of full backs he did better than Trippier that season, Trippier's form fell off the cliff. I don't want Burn there, but he'll be ok today I think.