McDavid injury a salary cap disaster for the Oilers. The Edmonton Oilers have not gotten off to the start they would have liked this season and certainly not the kind of start that many of their fans had expected from the franchise, and on Sunday things went from bad to worse. The Oilers announced that captain Connor McDavid would be out for a not insignificant length of time, one that would result in him missing the Heritage Classic. Losing a player the level of McDavid is always going to be a disaster for a team in the National Hockey League but…