As long as you make sure you don't loose your 1000' separation minimum.
If you loose it, you're in for a report, cause you were not "cautious" enough.
You could use a descend rate to be dead sure, but I've never used that myself in a holding??
Having aircraft report leaving/reaching is kind of procedural.... only use that one myself when we have no RADAR, though I rarely see any idea in having aircraft reporting leaving... reaching or passing is more convenient.