By all accounts Gedalia Greenzayd OBM was a special person who had a quiet charm and magnetism along with a zeal for learning. In the Morristown Yeshiva he would occasionally give a Shiur in Moshiach and Geulah which were recorded and made available online.
CrownHeights.info obtained links to five videos, one of which was a Shiur Gedalia gave just last week, in which he explains a number of Sichos of the Rebbe relating to matters of Geulah and Moshiach.
How Much Do You have to Pay for Moshiach?
Looking Inward to Bring Moshiach
Yearning Waters of Redemption
Moshiach Lesson Parashas Vayechi