I think our biggest quality is that we don't play in a set formation.
Theoretically Firmino should be the furthest player forward. Yet sometimes he drops as a deep as a six. Salah plays wide right fundamentally but then again is often natural 9 playing on the shoulder.
Mane is a left winger but then again drops off, links play but sometimes plays as a 10.
Lallana and Shaqiri are given a free role, apart from pressing, tracking runners, linking play, providing assists and scoring goals.
Gini was a 10, who knows how to links play, sometimes plays wide, drifts into being an 8 temporally but then drops in as a third centre backs and allows us to play out from the back.
Apart from that we play 4-4-2.
Lallana's ability to play in a number of positions is a quality not a problem.