Now just watch, Indy, Fi is going to prove you wrong and laugh about it LOL.
I do have one perfect example of the foal seriously outgrowing either parent. Back when Dad was showing Appy's, the ranch that he worked for bred a mare/stud combination a total of 5 times. Both parents were just slightly over 14 hands and 4 of the foals matured to around the same height. Then came Devilweed, who matured to over 16