How the mining pool work (in short):
1. A block reward is an incentive that miners get when they approve a transaction.
It consists of two components:
- Block subsidy
- Transaction fees
A newly created block is not considered a transaction - you cannot see it in the Tx list. 
2. In practical use, mining pools are accumulating amounts in the "payout wallet" and redistribute rewards (which can be optional). CatchThatRabbit pool has the following payout address: https://blockindex.net/address/cb6225ef1958b654995bd5bdf10e874c903e8a139669
Accumulating coins from rewards to pay to the miners.
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3. Some pools feed this address with additional rewards or even with custom structures.
Then, the total amounts in Tx ≠ total amounts in the Blockchain.
4. The formula to calculate the reward is as follows (in most PoW pools):
Your reward = 5 XCB × (1 - pool fee) × (your scoring hashrate / pool scoring hashrate)
Decentralization is on all levels - even in the pools themselves.