Pink kissing gourami stunted?

I've had this small pink kissing gourami now since late April. I was told he was a young one, hence his being smaller than the others (about two inches long). Since April he has been in a 55 gallon tank with two large Angels. They all get along pretty well except for the week the Angels breed. They all get fed twice a day and I do the regular water change once a week. He is a really happy fish and there doesn't seem to be a thing wrong with him.

My only question is why isn't he growing. I had the angels around June of last year and by September they had doubled in size. I do realize that they have different growth rates but at this rate he will be a very small pink kissing gourami at a year old, which is coming up. So he will be a year old and only 2 inches long.

Does this mean I most likely bought him stunted? He was in a ten gallon tank with nine brothers and sisters and I felt sorry for the little guy. His growth isn't a problem, we will love him anyway.