He has been filling holes but not always with like for like.
Short replaced by Stack. Tick actually an improvement.
Cotchin by Ross. Tick not an upgrade but best available.
Rance has essentially been replaced by Edwards, the leading score-goal assist player in the league. Ok for a week or two but not a long term option.
Ashbury was replaced by Menadue. We could afford to lose one 190cm back but not two. Pretty obvious we needed another tall down back.
Riewoldt by Bolton, Lynch is not Jack, he needs help. The shock benefit of a one tall toward line evaporated last year.
So we end up with Rioli playing taller than he should when he is already playing hurt. We end up playing Balta everywhere to try and cover height deficiency. We end up with too many linkup players on the ground with not enough contested ball winners to linkup.
This can work for a week or two but long term we have to replace like body types or we will end up with more injuries of our own making.