He asked for average weight gain for gainers. I wouldn't say 80 in 6 months is average. Acting like it is is just going to make him feel worse about his gains. That much that fast, if it actually happened, would cause health problems it would pile on so quickly. 12 is a bit on the low end but still good. Enjoy the progress you've made! Maybe aim for 20 more lbs in the next 6 months.
6 years