But it could still be goal difference after total points, in the first instance, with 3 teams, even if you discount the results against the 4th placed team. They could still all have the same points tally. Then goal difference and goals scored would apply. By its definition, it can only be head...
And of course, if 3 (or more) teams are tied, it is goal difference first to decide places, then goals scored, etc.
As it's very tight at the moment, it could get interesting later on, but the solution to that is to win our last three games and qualify as group leaders.