Former Scotland striker Ally McCoist was wowed by something that one Arsenal player did in the first half v Porto on Tuesday evening. Arsenal club captain Martin Odegaard unlocked the Porto defence late on in the first half at the Emirates Stadium. For forty minutes, the visitors put up a stubborn resistance. As was expected, Porto sought to frustrate Arsenal at every turn. The Portuguese took their time over every single set piece and tried to drag out each break in play. However, in the 41st minute, Mikel Arteta’s side found a way through. Odegaard picked up the ball just outside the area, a…