My thoughts on the Cowan sub situation is that he won’t be sub.
Carlton have named 8 defenders (Doc, McGovern, Saad, Newman, Weitering, Kemp, Young, Cincotta) so I don’t see why they would pick him as sub. If a Forward/Mid/Ruck is injured or tactically subbed then they would have 9 defenders. Matt Kennedy can play Mid, HF or HB if required and is much more suited to being a sub.