Manchester United’s injury theme of last season continued against Arsenal after they lost Rasmus Hojlund and Leny Yoro to injuries in the first game of their USA leg of the pre-season. While those issues derailed the campaign last year, it also provided the chance for some unexpected heroes to emerge from the fringes. Youngsters like Willy Kambwala would never have gotten a first-team opportunity without all those injuries, an opportunity he leveraged for a La Liga move this summer. One of those heroes was also on the other side of his career, as Jonny Evans came from the cold and became one o…