Well I would make a first impression on that as...... He is very well experienced in many areas mostly tkd. As a blue belt tho I'm nit sure that would qualify you to instruct bjj. Have to be already purple belt in my opinion. But I have been instructed by blue belts I still do we kind of teach each other our own style and thing we excel at individually. Best advice I've heard was to take a test drive at both places even tho one class alone may not do it try to get at least a week free.