Keeping it simple - to the GW (& MT) era, it was the most impressive debut for a MD big imho since Joe Smith.
Am trying to think of a big who had such an immediate, positive impact in their first game. The turnovers make me rate it behind Joe Smith's, and Joe Smith's success was completely unanticipated whereas OL's was eagerly anticipated (by me at least). One big who had a similar sort of debut that I recall was Jamar Smith. Am trying to recall the debuts of Osby, JW, Ekezie, and a host of others.
Brian Williams (who was before GW) had a similar sort of debut for the Terps back in the day.