I think the actual gain matters more than the percentage. If a person starts at 4” and gains like i did, wont it put him at 4.625”? It might not be a lot but i think anyone would be pleased to gain 0.625” flaccid length in 3 months.
I think it’s more realistic to expect a percentage increase rather than an absolute increase. Of course, we both have no data to support our respective opinions… So the truth is out there, and probs lies in between.
My line of thoughts: a longer penis contains more cells than a smaller one. If every cell in the penis divides (hypothetically) due to PE, then the longer penis will gain more than the smaller one in absolute terms, but both have gained 100%.