I very much doubt Thiago signs with us. If he does I suspect it will be because Gini leaves.
Keita is going to be a baller though and has been our best player since the restart, which isn't saying much, but he has been very good. His dribbling and penetration through the middle and cuteness with the ball with those effective knock ons and 1-2's with the others in midfield and attack means he will be an asset for us. He has to do more, a lot more and do it consistently over a season to really cement his place but I think Klopp will give him that opportunity.
I'd really love us to sign Thiago btw because of his creativity through the middle which we lack but unless one of our main midfielders leave I don't see us spending the money on him.
Henderson isn't a limited player but we do suffer sometimes when we play some of the midfield together as our game also relies upon the two full backs. Fabinho and Gini are our most tactically intelligent players and Klopp makes use of the fact he now has two players in midfield who can make the right decisions. When those spaces appear when the full backs move forward, Fabinho would wander into them knowing Gini would always drop in to cover. We don't get that with either Henderson or Milner on the pitch simply because they don't play as interior midfielders and move outside the shape.
However Henderson offers us more as a player with his passing which is underrated as his season average is 84% which is pretty damn good and he hardly ever gets dispossessed in possession. His drive to win, leadership and willingness to sacrifice himself for the team are all intangibles people don't see when watching us infrequently.
Against low-block teams we generally lack that creativeness and dynamism a fully fit Keita would bring or Thiago would bring. Against teams showing a bit more ambition then Fabinho and Henderson are the first two names on the team sheet.
We also see when Henderson is out of the team with injury that we lack something when he is missing. However going into 2021/22 both he and Gini will be gradually phased out from first team players to either squad players like Milner or have left the club completely. As they aren't getting younger.
But this is the Thiago thread as I said I'd love to sign him but I can't see it.