i agree, in the F2 you will find the widest range of phenos, some weak but some will be even better at something than the parents, for example if you cross a purple strain with a strong strain, in the f1 you will find plants that are kinda purple and kinda strong, but if you select a couple of those and cross them again then you can find a pheno more purple than the original parent or stronger than the original parent or even both