Sinclair can understand why Flynn would seize the opportunity to open: "I jumped at that chance because I just wanted to play. I had to get in the team one way or another. We don't have the luxury of a big talent pool in New Zealand for such a specific position. Compare that to Australia where most players take years to establish themselves at state level.
"I used to find it hard after a day-and-a-half in the field, especially if I'd been stationary in the slips. I used to like the middle order because you can see what's going on and get an indication as to what the wicket's doing.
"I enjoyed batting at three or four. It was a chance to chill out and take a mental break, even if it was just 15 minutes."
Craig Cumming opened in each of his 12 tests for New Zealand but spent some time down the order for Otago.
He plays his last first-class game for the province this week.
Cumming found opening less stressful: "I found opening held nowhere near the pressure compared to batting at three.
"I loved going in at 0 for 0 from 0. I didn't like adjusting to the mindset where you could have the pads on for 30 overs or be in second ball. You are always on the back foot at No 3, in my experience, because it involves the loss of a wicket. Openers can dictate terms.
"Having said that, it's a big call to open with Flynn given he's spent so little time there in the past.
"New Zealand is facing a South African attack that barely bowls a soft over in an innings.
"I'd like to see more consistency as to where Brendon plays.
"He shows the technique and ability to wear down and dominate opening bowlers."