Video analysis can be a batsman's friend and, as McClenaghan lost some pace, he worked more on strategic elements such as slower balls to maintain his influence. He now has 82 ODI wickets in 47 matches. Since he reached 50 wickets, he strikes every 28 balls rather than 24.
However, in T20s his stocks have stayed steady with a strike rate of 19, economy rate of 7.77 and average of 25.23. Those figures have been consistent for the past two years.
His influence has also been noted at a franchise level with contracts at the Indian Premier League's Mumbai Indians and English county Middlesex this year.
"[In recent times] I've been trying different forms of attack," McClenaghan said. "That includes slowing balls down to get batsmen to mistime because, as a rule, taking wickets is the easiest way to slow runs.
Hesson endorsed his left-armer. "As a T20 bowler, Mitch remains an experienced, shrewd operator.
"[The selection will revolve around] having a balance in the team. It's not a matter of picking your four best quicks. Some can open, while some are best bowling in the middle or at the death."
Elsewhere, Hesson confirmed the injured McCullum could play the final ODI against Pakistan on January 31. Southee was expected to be ready for the first test against Australia in Wellington, starting February 12.