To be fair, from JG's post-match comments, it appears the game plan he had in mind wasn't the one the players implemented on the pitch. To what degree, of course, we'll never know.
It's not surprising, however, that with all the different formations and tactics for the players to learn, there will be weeks when it doesn't gel. Hopefully, that will happen less often as the season progresses. Like all managers and teams, the sign of progress is how well they bounce back.