I mean this as a genuine question:
This is your company, correct? (I stalked your Github profile)
Seems like the types of problems you're solving are exactly those which require far more domain experience with Ruby/HTML5/Javascript/whatever than the ability to see the value of various graph-searching techniques.
Would you hire this guy even though he's said quite plainly that he lacks the experience with these technologies (and has difficulty picking up new ones owing to that lack of experience)?