In addition, Rangi Kui was the backs reserve, while coming in for this game specifically was lock Dawson Sisson - who, after no rugby since the Whanganui U20s in early August - was called up as injury cover for the bench, but graduated into the starting XV on the day.
"He performed very credibly, considering his first training was the captain's run on Friday," said team manager Chris Back of Whanganui.
Malo gave a captain's performance with two tries and a couple of conversions.
"Over the three weeks he really grew into that [role]," said Back.
"As a team, they turned it around."
Kui also slotted a late conversion after he got onto the field.
Back noted that Watson, the international judo champion who without the opportunity to travel overseas due to Covid would join St Johns Whanganui Metro this season, continues to improve.
"He's progressed well throughout the assembly. I think he's learnt a lot in the Hurricanes environment, considering he hasn't played a lot of rugby."
Adrole, who has already played a couple of games for the Whanganui senior team in last year's short campaign, was strong on attack and defence.
Over the three weeks of the tournament, the squad received hands-on training at various times from the Hurricanes Super rugby coaching staff, including head coach Jason Holland.
"They certainly held their heads up high in the higher grade of rugby," Back said.
Hopefully, the five players will feel like a rematch against Wellington Under 19, because the Whanganui Development XV is travelling to the capital to play them in their last game on Saturday.