wilbur might just need some more protein in his diet to make his wen grow! same case with 4 of our gf... when we first bought them, they had no trace of any wens! but they were still sold as "orandas". after about 3 months of waiting for wens to grow, i was convinced that we were ripped off at the pet store.
then i started feeding them a more protein-rich diet, and BOOM! all 4 wens are growing in nicely!

but your fishies are still very cute! oranda, or not!