Im confused on the effect of feedback warrior on an xyz monster

so lets say I have a rank 4 xyz monster I use feedback warrior effect on the xyz monster the xyz monster had xyz units before the effect activated so does that mean the xyz materials stay or do they go to the grave?

Allow me to answer your question. If I know what card you're talking about the effect is that it makes a monster level 3. Xyz Monsters are RANKS, not LEVELS..therefore cannot be targeted or affected by effects such as that. As for your other question....Xyz Materials ALWAYS go to grave if the Xyz Monster in question leaves the field. The only time they stay is if you use the monster to Xyz summon something else keeping the materials on it, but as monsters with ranks and levels can't overlay with each other, it wouldn't happen unless it was a special case. Hope this helps.