Unrelated, what's the plan for Raphinha given you have Saka who's nailed down the starting RW spot? I'd say LW is in more of a flux right now, not entirely convinced by either Martinelli or ESR.
Odegaard looks good so I think attacking mid is nailed and Vieira seems like he'll provide competition there.
I think it's just about providing quality, flexibile options across the front line. If you look at City last season, they had Grealish, Sterling, Mahrez, Foden, Jesus, De Bruyne & even Silva that played across the forward line, Liverpool had Mane, Jota, Frimino, Salah, Diaz & even the likes of Minamino & Origi in reserve. If you want to even try and get any where near these teams, that's the quality you need to aspire to.
Going into this summer we have Martinelli, ESR, Saka, Nketiah, Pepe & could include Odegaard. Given Pepe is out of favour, there's a clear gulf in quality & quantity, & room for 2 forwards.
Saka played nearly every league game last season which for a 20 year old is way too much. Given we could have an extra dozen games if we go far in the Europa League and the FA Cup, & that theres a World Cup in the winter, having no alternative would be poor for us and him. He already didn't look great at the end of the season and for England.
Plus, he's flexible enough to play in multiple positions and play them well. He was actually a left winger in the youth team, & Raphinha played a lot of minutes in the left for his Brazilian team apparently.