Probably the biggest guy I was ever with was a grower. When I first saw his "tent" in his shorts I thought he was joking with me and had put something down his pants. Then to my amazement he was only maybe 2 or 3 inches soft.
I myself am only 3.75 when flaccid but close to 7.25 when erect. I'd rather have a little flaccid penis and a big erection then a large flaccid penis and an average erection, however my lowly flaccid penis keeps me from wanting to do anything wild like skinny-dipping or venturing onto public beaches as well as keeps me from participating in the public showers for fear of people prejudging me by my softness.