A lot of overthinking being done ! The filter you have will work. It will collapse 1/8" when cover is tightened. The Gap in the rubber is from shrinkage. The rubber is designed to be twofold, seal for imperfections and also antirattle.
The name QUIETLINE gives us a hint as to the design of this system. It actually acts as a muffler to quiet down the noise from the intake. There is negligible pressure in the filter box as there is way more area for air to escape over and around the head and cylinder than there is in the hole to the airbox.
Hope this helps. Have a GREAT day !
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