There as a corelation between flaccid gains and eventual erect gains, but it takes time , and each is different in their response to PE.
When I first started I got good flaccid results and now I hang about 5 1/2” flaccid.
I put this down to constant stretches during the day and consistant PE discipline since december `09.
Recently I have been doing two-handed stretches that target sections of the shaft of my dick. I do 100 or so at a time with one hand holding tight at the base, while the other pulls working up to tugging under the glans.
Since I started doing this I have gained another 1/2” of flaccid hanging length which I`m hoping will equate eventually to erect length, as I`m trying to break 7” before christmas this year. (1/8” to go)