I think it's a bit harsh to say that Bate will go.
He has a lot of potential and he will get better. He's only 21.
On the other hand I hope and I think Sylvia will stay, as for Bell and Jamar it's difficult to speculate what will happen to them.
I don't think Adelaide or Port Adelaide would be looking for Bell or Jamar at the moment, both teams have good defences and a stable ruck formation.
If Lade or Brogan retire for Port Adelaide, I don't think they will be going for Jamar (who is 26 this year). Adelaide wouldn't be looking for him either as they have some young ruckmen in Maric and Griffin.