Egypt isn't evolving, they are kind stable and struggling to show their maximum performance while Cameroon gameplay is improving from a game to another without fluctuations.
It will shock you that Egypt will play in the finals and also take the trophy. You may not like their pattern of play and you think they are a struggling side but you have to know that they are playing to instruction to conserve energy. That is what matters. Not what the Nigerian team did by winning all their three group matches and then lost miserably to Tunisia.