Good luck. I agree that he may get bigger next year IF he makes it. He may not or he may go nocturnal as he gets older. In my area 4.5yr old bucks are much more likely to move in the daylight than a 5.5yr old or older deer. They don't get old by being stupid. I would darn sure hunt him hard and have no hesitation of shooting if the opportunity arises. I hope you get him.