Great thread. Right up my alley as I didn't start real golf until I was 25. I sorta did the Dan Plan, not by choice, but out of necessity. So here it is. No conclusions. Just facts.
I'd played about 8 full course rounds up until I was 25 and had sporadically played par 3 courses as I grew up which I really enjoyed. I played a number of the par 3's in England in the late 70's some of which were damn amazing and didn't mind in the least a kid from Canada going rd and rd all day.
A par3 located right in the city of Torquay in the south of England was groomed like freakin Augusta, perfect white sand and all. With a wedge a and putter I was always around par at that point but had almost no exp with any longer clubs.
A serious hip injury while playing hockey ended my tennis playing/teaching days (call myself a state level player) and it brought me out to a par 3 a few months after my injury. At first swinging a wedge hurt but within a year was up to swinging about 95 mph hitting reasonably consistent 3 woods. The first year I almost played exclusively at par 3's and executives. (usually 9's with a few short par 4's) and 3 or 4 over would the norm. Next season I started full courses and my first handicap was a 12 and by seasons end an 8 and to 5 the next season to finally to 2.5 the season after that.
Like Trout I was an 85% high school athlete but was highly competitive and almost always the team leader excelling in any hand-eye game. The racquet sports were money for me but also got to top of local levels in hockey, rugby, darts, pool, pinball, foosball whatever I could get my hands on.
Even when I was at my best I was 20 yds behind avg drivers and only could hit consistent yardages up to a 6 iron. The 5, 4 and 3 were hardly ever hit straight. My woods although short were reasonably consistent. Without my injury and starting earlier I feel a + handicap would have been achievable, beyond that who knows.
In good golf speak (scratch or better) I was a menace from 130 yds and in with my putting drawing compliments almost every time I stepped on the course. I was avg from 160, well below avg at 185 and about the same at 210. I'd be in the 30th percentile of drivers or worse.
One interesting thing about my game that I never could figure out was that I almost always hit the center of the clubface no matter what. It was the path I could never get right with the longer clubs.