I agree, but our midfield still needs work, a lot of work!
Yes indeed, but sometimes in football world opportunity to get certain kind of players. and that is the case for Kulu, I think
In Kulu investment they see him as exciting prospect and if there are no covid, maybe he will make his stage in Euro 2020 and he will be out of our reach
That is the logical think that I can think of the way in Kulu's deal
And for his transfer fee, I think we overpay a little (dont know if there are another club have interest on him)
For our midfield, lets start with what we have and already done deal transfer
Only Bentancur, Arthur and Rabiot that we need to keep, I am fancy Rabiot's talent ( you can see the glimpse of that from his goals against Milan)
At least he can be a backup that we can depend and plusvalenza next season
As we play with 3 midfielder, then we need 6 players in that area and maybe another player like a winger, wingback versatile enough to play CM in case we have injury crisis. So we only need at least 1 big signing for CM, I already said we go for Aouar, Locatelli (this both potential) and 1 big signing (boss midfielder). For that big signing, I give Casemiro as resemblence kind of player that we should look
and yeah, we will need only 1 or 2 players more if we can get Klopp

I will only take SMS and Locatelli if that is the case, maybe try to swap Rabiot with Aouar. SMS will be our biggest signing