This allowed former national enduro champion Jason Davis (KTM 300XC) to dominate at Riverhead near Auckland.
Wellington's Whitaker (Husaberg FE250) is a seven-time New Zealand Moto Trials Champion, while Auckland youngster Draper (Husaberg TE 125) is also a deft exponent of the sport of trials riding.
Both young men have switched their focus to enduro riding in recent times and have shown plenty of early promise.
Whitaker has not yet won a round of the KTM Extreme Enduro Series but he does share the lead in the pro grade points standings.
His second and fifth finishes give him 38 points, level-pegging with Tokoroa's Sean Clarke (KTM 300 EXC), who finished third and fourth in the first two rounds.
Draper is currently third in the pro grade standings, just four points behind Whitaker and Clarke.
However, the smart money still rests with Aucklander Birch to reclaim the podium top step on Saturday.
The man from Glen Eden has just returned from another successful overseas adventure where he finished runner-up in the Roof of Africa Hard Enduro in Lesotho last month.
Racing begins at 9am today.
Round four of the series is the Te Puke Endurocross on February 8.
There are five rounds in the series.