I have seen pure-bred bullies in all sizes Phil, Diva was a small dog compared to heavy weight Tilly for example .
Tilly was 65 plus lbs , Diva tried hard to get too 50 lbs without being over weight , We will see with Rosie she is working on 7 months and is 40 lbs now, All are females
I try hard to pick a large Female only from a breeder , Rosie was as large or larger then males in the same litter and was always hungry .
I think Buster is perfect to be honest with you , he is a wonderful temperament from what you have said, he is a beauty bud.
Are you kidding me Buster is Fantastic just think how he would feel 40 lbs heavier sitting on your lap and how much harder it would be on his joints. Always thought he was an incredible looking dog and love reading about his escapades - you did an incredible job with him Phil nothing but pride and a few laughs.