He would have to be pretty short for a weight of 132 to be a healthy weight for a man. It's probably not a good idea to tell someone how much weight they should lose when you have no idea how tall they are. Granted, if that is kilograms, a totally different story. Besides, ANY weight loss will make a difference with insulin resistance.
A1c is NEVER appropriate to diagnose diabetes. Under 6 does NOT mean no diabetes. Mine was 5.9 when I was diagnosed. And that's still almost an average bs of like 135, which obviously isn't normal.
A fasting of 110 isn't diabetes, but it's still not good. It's pre-diabetes.