The 20% rotation share is an exploration budget. It buys information about alternatives and limits self-confirming performance rankings. The design question is how that budget should change as score noise falls and the miner pool matures.
Claims also limits a draw to one UID per coldkey and rejects nearby Axon IPs. That matters because rotation among aliases is not exploration. Identity diversity and opportunity diversity are complementary safeguards.
Rotation addresses a particular economic problem. When a ranking also allocates the next evaluation, early noise can become self-confirming evidence: selected miners get more chances to establish a record, while excluded miners remain hard to evaluate. Claims always gives newly registered miners a chance to prove themselves.
Those lanes solve different problems. Qualification tests miners with little evaluation history. Performance exploits evidence from recent scores. Rotation preserves exposure outside the performance ranking.
Claims is live on Bittensor SN111. Its current mainnet baseline samples a fixed number of miners per cycle: 40% qualification, 40% recent performance, and 20% rotation. The implementation and operator notes are public: https://t.co/liMVqsLvSI.