Excellent observations.We should have been contenders this year but for a horrid run with injuries.
In midfield, last season was on a knife edge with poor performances early, it turned with new roles for Blicavs and Atkins that ignited things. This season, it's Selwood, Guthrie, and Dangerfield that have been the problem. Selwood is gone, Dangerfield has had limited availability after the broken rib, and Guthrie limped through the first 6 games before pulling the pin.
That has meant Bruhn, Holmes, O'Connor, and Miers have had to attend a significant number of centre-bounce and they just don't win the clearances/ contested ball required for us to be competitive over the course of a game. Bruhn is getting there, and maybe Holmes will too though he's currently a good winger. But Miers will never be big enough for an inside role, and O'Connor is simply too defensive with that role better filled by Blicavs and Atkins.
There's been other problems with Cameron taking hits, inconsistent performances in the ruck, and structural issues down back playing Ratugolea. But those are typical regular season problems ironed out in the home and away. What's been fatal is the lack of ball-winners in the midfield. It shouldn't be hard to fix this off-season with maybe a veteran recruit, and may resolve itself with the development of some young guys and the return to health of others. And as has been the case for a decade, we could always improve in the ruck.