The Rebbe explains why the Torah uses "Vayamtziu" (prepared) instead of "Vayikrevu" (brought) for the Olah. Unlike the Chatas, which required Aharon to dip his finger, the Olah was thrown from a vessel. By handing it over, the sons provided a "finished product," highlighting their total, ready participation in the service.
https://www.torahrecordings.com/likutei-sichos/032/006_001