In reality, the share log is paid based on when the work was issued, not when the block is actually found/submitted.  This prevents a few unlikely attack vectors like a user finding a block, holding on to it, then adding a bunch of hash power to the pool before submitted the block thinking those shares will be paid by the current round.  In reality, they would be put towards the next round since shares submitted after the block-finding-work was issued isn't paid/rewarded by the block.