You're right mate, but we can't go through season with an unchanged starting XI. For me you need a first team squad of 14/15 top players, with another 10 or so squad players if we are to challenge the top 6. That would be 5/6 to cover the front 4 (and I don't yet consider DCL as a top player), 3 to cover the midfield 2, and 3 to cover the CB pairing. If we managed to bring in Zouma I'd be happy with the CBs (Holgate as second cover). If we keep hold of Geuye and bring in Gomes, we'd need to bring in another BTB CM. We have Bernard, Ricky and Siggy up top. We'd need to bring in a goal scoring first choice centre forward and have DCL as cover. We'd also need to bring in another goal scoring speed merchant wide player. Lozano would be my first choice but I'd also take Neres in a heartbeat.
I think there will be plenty of games to go around to keep 14/15 first choices happy and match fit.
So, including Zouma and Gomes, I reckon we need to bring in 5 top players this summer, all good enough to be considered regular starters. Luckily Coleman's return to form means right back is no longer considered a priority.