That's a nice bet there, but I'm not with Coral, and also think it's a bit too random... Ie if he came back into a game and then realised he was too unfit or he takes a knock to his foot, then we are screwed for that.
Those of us on betfair, a spot I've made is that its 3.3 for McBride to top the USA scoring campaign in the competition. He plays as a lone striker-ish tomorrow in all probability, and so he could well end up being their top scorer. Not a sure thing, but the odds are pretty nice atm.
Though if you don't fancy USA to make it out of the group stage, then it might be unwise, since in the group stages random goals from midfielders and wingers could prevent him being top scorer.