A good candidate for biggest offseason (quite solid muscle)could be :
1.)Kachi Nwachukwu: 240lbs (some years ago, a bit leaner nowadays)
2.)Denise Faith (from Sweden): 230lbs (even shredded ,not less then 219lbs
3.)Amber Deluca : 220-225lbs
4.)Dee Alexia Fierhuus(f. Finnland) : 220 +
5.)Regina Albuquerque(Brasil) :220- (growing quickly last year)
6.)Dominique Danger aka. Shereen Fons: 220+ (by only being 5`5``)
and a lot ,lot more ,I don`t know exactly the weight......