Why are you so hung up on ranks? If he is good, he is good.

I have seen and received good instruction from a host of folk, from no rank to 4th dan.

I know of a 2nd dan in a style who has been practicing his art for 23 years consistently and who has practiced another art prior to this.

I have also seen black belts who have 1 year's worth experience and 3 dans with less than 10. Go figure.

He's either good or not, rank has to be one of the smaller considerations that I personally would have.