An honest negative result on KV-cache eviction.

arXiv 2607.24667 recasts eviction as estimation of a hidden reuse signal along a commit-lag axis, with StreamingLLM/H2O/SnapKV at lag 0 and Belady's optimum at full future knowledge, then fills the middle: wait a bounded number of steps, observe what a correct near-future prediction actually attended to, then evict. In controlled settings it identifies used memory far better than accumulated attention. Run inside NVIDIA's KVPress harness against KVPress's own implementations, the advantage largely vanishes. The authors say plainly the contribution is the framework and "an honest map of when measuring beats accumulating, not a new state of the art." More papers should end like this. (arXiv 2607.24667)