When a sector is genuinely working, money rotates down the ladder: the obvious leader runs first, then the higher-beta names that haven't moved yet tend to close the gap. This radar finds those laggards — but only in sectors that are actually working (a broad, rising group), behind a leader that genuinely ran, and only where the laggard is a healthy company the tape simply hasn't found yet. A laggard with collapsing fundamentals is a value trap, not a catch-up — those are gated out.