So it's the fact that Malawi scored 3 goals against Nigeria while Nigeria only scored 1 against Zambia is what basically guaranteed Malawi were through. Got it. My brain hurts.
Malawi 3-2 Nigeria Malawi 1-2 Zambia = 3pts 0GD | GF 4 Nigeria 2-3 Malawi Nigeria 1-0 Zambia = 3pts 0GD | GF 3 Zambia 0-1 Nigeria Zambia 2-1 Malawi = 3prs 0GD | GF 2