Vettori bats above Flynn for Northern Districts. Vettori is no international number 6 and Flynn is somehow expected to now be an international opener that after averaging 28 after 16 tests in the middle order. Strange.
No he doesn't...
Vettori might have done it a couple of times in FC, but usually Flynn would bat above him. He's opened for ND before, and using your logic, James Marshall batting ahead of Vettori makes Marshall the better batsman.
The only case for 5 batsman is if you don't have 6 batsman. And with Flynn and Brownlie we have 6. But Brownlie needs a 50 to make his way into the team for some reason. Apparently to show he is over his injury. There may be something to his unfitness as he is hiding down the order for Cantabs in their current match (at least on teh scorecard he is)
Woah there, it's a bit early to be talking of Flynn as test standard after a few hundreds in the Shield. He deserves an opportunity, but considering we have three and a half test standard batsmen currently available, I wouldn't be putting too much faith in Flynn yet.
The other case for five batsmen, allrounder plus keeper is if you need the four seamers to take wickets. Considering Southee's current crapness, Vettori not being able to take wickets very often and Gillespie's mercurial nature, only Bracewell and Martin can be viewed as consistently quality, and they both only achieved that this season.
The five best batsmen in the country must be picked, and the five best batsmen in the country need to man up and play properly. They've all proven they are capable of doing it, which makes their inconsistency even more frustrating.
McCullum
Flynn
Brownlie/Williamson
Taylor
Brownlie/Williamson
Vettori
van Wyk
Bowlers
Brownlie/Williamson (along with Flynn opening) is a tough one on whoever draws the short straw to bat at three, but leaving either out for Guptill or Nicol or whoever is a waste of a decent batsman.
edit: though all of Williamson, Flynn and Brownlie could play and bat in the middle order if McCullum and Vettori opened