Even though he struggle last season I still see him good as starter. Its just Warrior just have a disappointing season and maybe that affect the confidence of people. But also I think Klay is perfect fit on Mavs since they need additional shooters, He can play together with Kyrie and Doncic. The only problem is the ball rotation since the ball always stays long in the hand of Doncic. But for sure when they have three shooters in team especially if they can acquire Klay for sure he adopt on the rotation and let them perform their assignment in court.
Lakers would be a bad destination for Klay knowing that they are only focus on Bron and for provably that he will totally experience a career decline especially if he will go on Lakers. So for better competition and betterment of his career Klay should go to Mavs since this is best team he could join .
I do get that his playoff series was terrible, but he is coming off an injury as we know and him being a bit slower with age and that injury it becomes understandable. He did managed to get a title after it, but he is getting older and more tired. He is not used as a spot up shooter neither, he is used as a primary defender of whoever is the star on the other team, so his old age and injury probably still bothering him and being so active on the defense all combine to mean that when they are on offense he is not that great.
However, would I not sign him? I would definitely sign him, unless they are getting someone better guaranteed, then they should keep him, plus they may get rid of Wiggins, so they could actually have some decent line up again.