His stats have dropped a lot, I hate to see a former champ not doing well in a championship team.
Look at his stats this season and compared it in the previous season.
https://www.basketball-reference.com/players/g/gasolma01.html
I agree with you 100%. He can not be compared with his brother's quality at all. I remember when Pau Gasol was in Los Angeles, it was a show time see Kobe Bryant and Pau Gasol playing together. Now you see his brother and it is like a statue, he can not defend to anyone. Once Anthony Davis will be back, he should go directly to the bench because there is no way to win a single match thanks to Mark Gasol.
His stats this season are really bad, thanks for the link.
He won the defensive player in 2013 - https://bleacherreport.com/articles/1638277-lebron-james-chris-paul-headline-nba-all-defensive-1st-team
Therefore this guy is a proven defensive player, but with the Lakers, not being a starter, I think he is still adjusting on his role or it's true that he doesn't fit to the system of the LA Lakers as he was used to the grit and grind type of game and a little slow game.