The Plunket Shield can be a hard competition to review, because oft he 76 day gap and extremely different conditions at those different times.
Some of my takes on the more note-worthy individual bowling performances/developments from the younger guys this season;
Mitch McClenaghan has had a pretty remarkable return (from mediocrity to awesomeness) in both forms that he was selected in. Willb e interesting to see if he can back it up next year.
Willie Lonsdale had a breakthrough year. 30 odd wickets, looks sharp, haven't been able to make out if he does much with the ball in the air though from the video highlights.
Matt Henry. Had a great debut at the arse end of last season. This year he excelled in all 3 formats, seems to be able to step up. Judging by his batting in the Saffa match he has an unflustered temperament. I'm really interested in this guy, hope his back is not too serious.
Bevan Small. Also did well in multiple formats. Video highlights look promising, has bounce and movement/swing.
Kuggeleijn shows promise. 20 wickets at 38 is a steady haul. Started well but tailed off towards the end of the season. Perhaps a sign he needs more to his armoury than yorkers and bouncers. Decent pace, only turned 20 during the season.
I'd probably describe Milne's season as "consolidating". Still amazingly only 19 years old. At least an ankle injury doesn't sound as serious as back/knee etc. Only 3 Plunket Shield games in the first half of the season. But plenty of game time in the white ball formats. Not basing this on much evidence - but I would like to see him do more with the ball other than just pace.
Boult is above this category now. While Wagner keeps hauling in wickets, a timely return to form though in the last round of the season.
I don't know a great deal about spin bowling., But the Plunket Shield has 60% of it's season in late summer/Autumn and the spinners are very important to their teams (despite the NZ sterotype).
I'm interested in both Astle & Nethula. Yet have feelings of both 'they're leggies - get them in there' as well as 'they're leggies, which are rare in NZ, therefore may be over-rated'.
If Astle taking 31 wickets at 38 is considered slightly disappointing, then I think it's good he's set high standards. At the very least a good consolidating year for him, 31 wickets is a good haul.
Nethula benefited from being in better form early in the season and from playing across all formats. Definitely a big year for him get international exposure, 24 wickets at 30 in the shield.