A military source said the special forces tactic was beyond the scope of conventional infantry.
Defence sources also said concerns about Major Wilson had been raised with one of the military's most senior officers, Land Component Commander Brigadier Mark Wheeler.
The Herald understands questions around leadership and the training for the deployment to Afghanistan are part of a Court of Inquiry investigation into the battle.
The Defence Force said in a statement: "Military personnel develop their own leadership styles and at various times leaders are assessed and mentored on their style. Major Wilson did receive some specific guidance ... from senior officers before the deployment. This is not unusual."
The Defence Force refused to answer questions about tactics, saying it would cause security problems to do so.
The battle at Baghak reveals the closely guarded proactive role of the Kiwi "reconstruction" team in Afghanistan.
The current deployment is the last - New Zealand is preparing to pull its troops out of Bamiyan after 10 years in the province.