Re: recessed can lighting and attic insulation
You will need to find out if the recessed lights he used are IC rate (insulation contact) or not. If they are you can insulate right over them if they are not they depend on air circulation to keep them cool and if you insulate over them they will over heat and the thermal switches in side will turn the lights off until they cool back down.
You say you had to replace the front half of the roof because of mold. If you are talking about its growth outside on the roof My guess would be it was the north side of the house where it receives little or no direct sunlight. Installing zinc strips near the peak of the roof will prevent recurrence.
Be sure you live your life, because you are a long time dead.-Scottish Proverb