No, they won't.
Whether or not it was provided by a third party supplier is irrelevant.
It does not make disney any less infringing if they are the ones selling it.
It just means you can sue disney, and then disney can turn around and attempt to recover the damages you win from the next guy up the chain.
You absolutely, positively, do not need to sue the people all the way up the chain.
I am an IP lawyer (though this is not legal advice, just an explanation of general concepts :P)
If Disney is the one selling the bags, surely they are the only party it would make sense for the artist to make a claim against?
If I, A, lie to you, B, and as a result you take a supposedly-harmless action which is in fact a tort against aggrieved party C, I would expect you to be liable to C, and myself to be liable in turn to you. What did I do to C?
It just means you can sue disney, and then disney can turn around and attempt to recover the damages you win from the next guy up the chain.
You absolutely, positively, do not need to sue the people all the way up the chain.
I am an IP lawyer (though this is not legal advice, just an explanation of general concepts :P)