The only argument I see for keeping Guptil is to let him grow and learn at the top level. We might as well build a player for the future mentality. ie why play Sinclair there who is never going to get better.
I voted no however on the grounds that we dropped Flynn who has a better average than Guptil (if you take out the Bangers factor) 26.63 vs Guptil 24.36
If we were going to keep players in the team because they are young and have potential then we would have kept Flynn. But we didn't keep him because he had technical deficiencies. And Guptil has technical issues (although I note his backfoot defence has improved).
Basically it just isn't realistic to keep a non performing player in the team because the selectors will get the sack. They need to ensure there is accountability for performances or they have not done their job.
Auckland 47,103, 27, 269*, 59, 118