Just because you’re getting only nighttime pics of a certain deer does not mean he is nocturnal. He may be traveling a long way to get to your area or just may be passing through occasionally. You need to find his core area by which I mean is where he spends the majority of his time. This time of year is tough to figure that out as if he is not already cruising all day he will be shortly. Hunting the rut is a lot of being in the right place at the right time. It’s much easier to pattern a bigger deer early season and late season when food gets lean. I have had great luck hunting deer during the late season when a front is approaching as you may get lucky and catch him on his feet during shooting light. If you are hunting a creek bottom, which it sounds like you are I would be sitting that creek all day long and try to push as close to known bedding areas as much as you can. Look for crossings where they are crossing the creek as they are usually a great place to set up.