The marks are there to get the right teeth when assembling the engine, but as far as I'm concerned are close enough that if they are aligned it's close enough that you don't have to worry about it.

I have never used a dial indicator on wheel bearings, but I've been packing and adjusting wheel bearings for forty years, so I think I have the FEEL for it. If freshly packed, I torque the heck out of the nut to squeeze out the grease then back off and lightly snug the nut while turning the drum/rotor and lock.

This method works for me as I've never had slack at the time of packing and I've never lost a set of wheel bearings.

Have a great day,