It's not about 'up-grades', it's about the players that Koeman needs to apply his aggressive, high pressure and more direct style of play. We need strong, direct, fast players, we need players with high stamina and we need leaders. The players we are signing fit this bill, the players outgoing either don't or haven't bought into Koeman's Everton.
The upgrade I think most of us we agree on is in the manager's seat and that's what will improve us more than any marquee signing.