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Generally speaking yes, exceptional circumstances. There might be others outside of those specific 4, but those are the sorts of reasons why a player wouldn't go into a hub.Valid reasons for not going to a hub.
1) Birth of a child
2) Special needs child.
3) Terminally ill parent and or family member.
4) Injury that would prevent you playing in the hub.
Any reason outside of these in my opinion would require some bloody good explaining to do so you can keep your career.
I reckon for the vast majority they are all trying to keep the game going and that is at all clubs with no exceptions. Decisions are being asked of players that have never risen their head before, nothing is easy here. I think as a group the AFL players are trying their best, there will always be some that may milk a situation but that is just life.
I've not yet seen any player not go into a hub for any other reasons than those or similar, which are perfectly reasonable.
Why then was there so much premature vitriol and negativity to Richmond and particularly grossly unfair abuse of Cotchin, when despite being injured he's gone to the hub. Could it have been when he expressed concern, he was doing so as a representative for his players who he knew would have babies on the way?