There is no sure way of knowing if this buck will ever come in. If he is always following the same patterns when he is seen chances are the rut has not kicked in yet. When the rut comes closer im sure the decoy and the can will get his attention enough to bring him within range.
However there are no definites in hunting. Stick with it you will get him.

Kill em' Wide and High!!!

Steven J. Collins (Trock63)
Bowdaddy Productions