Wouldn't say lower...
It's likely just a random mutation caused either by chance or that his father used battery acid as lipstick when he couted the mother (can't remember the name of the tribe - but there are people who actually do that).
If it turns out to be a benefit it might evolve to become the common thing over the course of a few million years. However, with this bright new society thing we have it's more likely that he'll get burned for being different... 
Edit: If you could retain the same level of motorskill while having six fingers - that would be awesome for playing guitar!
It is preferential to refrain from the utilisation of grandiose verbiage in the circumstance that your intellectualisation can be expressed using comparatively simplistic lexicological entities. (...such as the word fuck.)
Remember your humanity, and forget the rest. - Joseph Rotblat
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