I agree. Southee is not known for his change of pace or accuracy. But I wouldn't blame the decision to give him the opportunity to bowl, because he was the most experienced bowler out there. Most of the teams outside the big 3 are facing issues due to limited player pool, and in case of New Zealand this has reached a stage of high severity. Despite additions from countries such as South Africa (Neil Wagner, Colin de Grandhomme.etc), they are still unable to reduce the over-dependence on some of their bowlers.