Well, Metta was willing to come off the bench this season and he handled not playing as many minutes last season ok.
I think part of the reason that he's shooting poorly is that he's playing too many minutes. He seems to fade later in the game. I think that's supported by his poor FG% in the 4th compared to the rest of the game.
That plus him getting his shots with the bench unit would make him ok to me.
Yes often metta starts 3 for 4 from 3 and then falters a little after halftime. Especially on back to backs.
But the thing is he doesn't care if he plays 48 minutes and wouldn't asked to be taken out. Kobe and him have tthe same dna in that aspect. But the main problem is, that we have to look at the others around his position.
Gasol plays the 4 or the 5. When Gasol was a 4 metta subbed for him and often finished games instead of him(till Pau cried) and then if Jamison's shot wasn't falling, Metta played for him. So having Clark has taken SOME stress off him but with Gasol's constant nagging D'antoni rushes to put Pau in so he stops complaining. So then Metta has to stay longer till Clark comes in to pair with Jamison. And if Jamisons shot stops falling his defense is non existant so Metta is put in again.
For Ketta to get "rest" it depends on the performances of 3 other players that take up space at the 3 and or 4.
So given the inconsistencies of both Gasol. Jamison and sometimes Clark, Metta doesn't get much rest. And he's depended on because he's more consistent than all 3. Though Clark seems on his way in a good way.