https://www.slamonline.com/nba/pau-gasol-lakers-nba-comeback-marc/
Reading all related articles about that, I see that aside from he wants to play his brother, Marc, he badly wants to retire as a Lakers. Almost consider retiring after injuries but really wants to do it in a Lakers jersey (last played in 2019 with only 3 games with the Bucks).
Pau was also willing to take any offer (well, he should) for his target to be considered signing again to the Lakers. If by any means, that was possible to happen but a waste slot if Pau will get injured again. His situation is different when the Lakers sign the veterans e.g Dwight Howard, Rajon Rondo (which are still on their post-prime).
He's a veteran and has a name but you are right that because of his capacity, he won't do better than other young players that has also gained experience which can contribute better to the team. But if that's he wishes to do, I hope Lakers will grant his retirement wish.
It's good if Lakers will get him so he can retire as a Laker, also this is his chance to play with his brother in the NBA as they never played before, I see them playing well only with the Spain where two Gasols are a big threat in the inside. Hopefully the Lakers management will give him a chance, Gasol helped the team to achieve multiple championships in the past, so his contribution to the team is unquestionable.