I explained it a bit more in my comment to @edicted if you want the lengthier answer:

In short, the rewards for staking CUB will still flow to the CUB den like normal. Users will now also have the option to stake in the CUB Kingdom. The CUB kingdom will actually take the stake and pool it in the CUB den but then autonomously compound the CUB harvests it earns.

So no new additional inflation is necessary since all the rewards are still being paid to the CUB den. The difference is that the Kingdom will manage those rewards for you

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