I wouldn't be so quick to dismiss Onana. He's very good at winning aerial duels which has been one of our biggest issues this season with defending set pieces. That gets improved instantly if he signs. Bissouma doesn't win headers.GLC was never fit consistently when Maddison was out. Story of his career.
I don’t think we sign Ugarte tbh and Onana isn’t even close to an upgrade on Bissouma. Biss needs competition to force him to be consistent
He's a good tackler as well. He's good at winning the ball back high up the pitch the moment it gets lost. That prevents a lot of transitions from occurring which has been another issue for us this season and can keep the play alive instead of constantly breaking down leading to counters. He has good positional sense as well to cover spaces during those transitional phases and just out of possession generally.
He can retain possession as well due to his physicality allowing him to shield the ball and hold onto it for longer. We've had issues just keeping the ball this season which leads to us turning it over more often.