Scotland legend Ally McCoist was full of praise for Manchester United matchwinner Scott McTominay as he scored twice in Wednesday’s 2-1 Premier League victory over Chelsea. Right, own up. Who on earth decided that Scott McTominay should be a defensive midfielder? To think, all that time he lumbered through games in an ill-fitting deep-lying role could have been far better spent crashing into the penalty box and converting like a seasoned number nine. Against Chelsea, McTominay did his best Frank Lampard impression, breaking into the area to devastating effect while taking his tally to seven go…