Having re-watched it i definitely get the feel Dunc decided to make an example of him.
I get the impression both are at fault but the underlying feeling is bringing him off was extremely harsh but it's also a message from Dunc that a lack of following instruction in unacceptable.
Little breakdown of his brief cameo;
- Thrown on when we were playing 442, hard to tell if he was instructed for LM or ST but Richarlison clearly tells him to play alongside DCL.
- After conceding we immediately switch to 433/451 and Kean is asked to play from the right.
- A few times Kean is clearly told by Dunc to get back and help protect Coleman, in fairness he put's in the shift to help but put's in clumsy tackles typical of a forward out of position.
- Kean then starts to drift away from the right and take up more central areas while also neglecting the defensive side of the game, DCL then becomes the RM.
- Just before Niasse comes on the camera shows Dunc agitated with someone high up the pitch to get back, camera pans out and DCL is nearest to the touchline with Kean now effectively the lone striker.
From that last camera before the sub i feel Niasse was going to be on for DCL as the lone striker, but seeing Kean not follow instruction was the final straw and Dunc took the decision to make an example of him.
It's an incredibly harsh punishment that late in the game but it's also a huge statement to the rest of the squad, as long as the big man's in charge you listen and give 100% or don't bother at all.