@steven-harris not necessarily, Holland is the head coach so he takes the blame IMO. Blackwell and Prinsep were being selected before Gibbes arrived on the scene aswell so they are obviously Holland's favourites.
You've just highlighted my point of having bigger forwards around Blackwell if he's continually going to be selected. I'd love to see a loose forward trio of 6. Howden / Plumtree 7. Savea 8. Flanders for next year but I highly doubt that will happen. Hopefully with Dominic Bird at the Canes this year, we should have a bit more size in the locking department aswell.
In terms of props, I rate both Numia and Mafileo (who's been out with injury for a while now) slightly ahead of Rakete-Stones. They are all young and promising though so I will be interested to see who steps up there. Having Owen Franks in the squad will be great for all their development, especially for someone like Alex Fidow who may find himself on the outer if he doesn't improve his scrummaging next year.