But there have been two that were very close.
First, as mentioned in a comment by Forecheck, Dave Hymovitz had a decent debut for the IHL Aeros in 2000. He was the Aeros lone trade-deadline acquisition that season when Ron Low shipped Jeff Daw to AHL Lowell on St. Patty's Day in 2000.
Hymovitz (who later played for the Ottawa Senators) did not score five goals in the game vs. KC at Kemper Arena -- Joe O'Donnell and the PR staff got it right. He scored four in that televised game at KC, but he followed that up with three more in the next game at home against Utah. He is the only Aeros player EVER to score seven goals in two games. How is that for a debut?
That was a good performance, to be sure, but when Roman Voloshenko turned the trick in 2005, he did it against Chris Osgood, who was with Grand Rapids on a rehab assignment. (And you know that jock strap that Ms. C drew for Climie? It is on the opposite side of the arena from Osgood's.) Volo's first goal that night (just 28 seconds in) was an absolute sick wrister from the blue line that I still remember VERY clearly. That opened the floodgates.
That night at Toyota Center, Voloshenko scored two goals on the power play, which is why Wellman's performance cannot be disputed as the single greatest.
If you are on the team and are reading this today, please call or text your teammate with this news. The Aeros have been around a long time and have feature many great players over the year, but Wellman's game against the Rampage Friday stands above them all.