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Co-witnessing is nice, but not necessary. It makes sighting in one or the other easier, as well as telling if the zero has been bumped. (if it's a big bump) The point of BUIS is that they are back up to your primary sighting system. If you're primary sighting optic is working properly and not damaged or pushed off of zero, there is no reason to use BUIS. If you're optic is damaged, dead battery, moved from zero, etc... the best thing to do is remove it from the rifle for an unimpeded view of your NEW primary sighting system.
A quick release mount makes it easy and fast to remove. As well as replace if it's something as simple as replacing a battery, cleaning, etc... Larue is hard to beat for a reliable return to zero quick release mount.
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"There is no greater tyranny than that which is perpetrated under the shield of the law and in the name of justice. -Charles de Secondat"
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