Culture < Core Values ... that is the greater question. Does the person align with your Core Values and that of the company. Culture is a product of a number of things ... but the greater and more measurable metric is Core Value fit.
I have made the mistake of keeping staff because they fit the culture, but the fact is that the culture needed improvement and I wasn't aware until much later because we weren't measuring alignment with Core Values on a regular basis. Core Values alignment is the heartbeat of the Organization. I have a number of blog and podcast posts on this subject here http://wisenapkin.com/tag/core-values/ ... feel free to check them out (especially the one with Christine Comaford) and let me know if you have any questions.