I wouldn't call them mutually exclusive if you allow for the existence of some degree of altruism, pride and perhaps also strategic location and public image.
It can be worthless in terms of military contribution, or that is how I understood it, but it still helps the NATO portrayal of a safety umbrella for those who feel threatened and is therefore a worthy member.
By the way, too lazy to check the originals now, but the two positions you "quoted" there basically say the same thing, that NATO shouldn't/wouldn't accept Montenegro.
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