As Tactician said, it still can be manipulated. Say I'm a Level 10 team (I guess 100%=70Q) and I have 3x20Q and 11x80Q players. My average then is only 67.1, that is only around 90-92%, while my Top 11 are around 140%. They could've made it Top 11 players, then it'll take a lot of resources to make an 8* team for my level.