I'm guessing his molt is normal. You would think that with five birds, I would be an expert molter, but to be honest, mine all molt at different times and they last for different durations. One seems to last only a couple of weeks and another lasts almost a month!
I would say that as long as new feathers (pin feathers) are coming in, he's fine. If one molt lasts continuosly for more than a month, I would seek an avian vet because there are some vitamin deficiencies and conditions that can cause excessive molting.
Congratulations on your new two by the way! I love their names!