Also, that's a very common situation with ISO taper spindles, which have a much longer taper section than JIS spindles. Even if an adjustable cup with an external lockring is used, there will be a noticeable gap between the crank arm and the cup / lockring. The installation on my Protype / Sugino 75 looks just like the photo. You should always tighten the crank arm bolts based on torque, and the value I always use is 400 in-lbs (33 ft-lbs) for square taper spindles.