the WG couldn't cover that 2 yonkos were defeated but they are trying to cover up that Luffy was the one who defeated Kaido alone (more or less) so they are giving Kid and Law more credit than they really deserve.
so don't mind the bounties that much. after that they might even give Zoro and Sanji < 1B bounties.
The three Bil bounty for Luffy is kinda a downer considering the death match he had with kaido. Being given the same amount as the tag duo sucks. Would have been nice of they got 2.8 while Luffy stayed ahead with the 3Bil