Those that have improved from last year - Cotchin, Vickery, Rance, Grimes, Batchelor, Foley, Thursfield (imho has finally found his place), Dea, Browne, Nahas and King.
Positive inclusions to the squad - Houli, Batchelor, Conca, Grigg, Helbig and Miller (short term).
Earlier in the season Dusty would have been top of that list too.
So for mine that is 17 or 18 positive improvements to the squad compared to your 15 possible players who you metioned may have had a stagnant season or gone backwards.