If you compensate according to share-of-the-total, then yes.
If you pay everyone according to the their impact vs the case where they did nothing, then no, but you have a different problem. Suppose, for example, you want to reward a firing squad who have killed Hitler. Without any one of the shooters, the others would still have shot Hitler. So none of them can claim any counterfactual impact. But surely they should (collectively, if nothing else), be able to claim a reward.
So there is at least a practical question, of what procedure to use.
If you compensate according to share-of-the-total, then yes.
If you pay everyone according to the their impact vs the case where they did nothing, then no, but you have a different problem. Suppose, for example, you want to reward a firing squad who have killed Hitler. Without any one of the shooters, the others would still have shot Hitler. So none of them can claim any counterfactual impact. But surely they should (collectively, if nothing else), be able to claim a reward.
So there is at least a practical question, of what procedure to use.