We heard the "projectable" word a lot while being recruited. My son is a LHP, 6'4", weighs 210lbs, throws in the mid to upper 80's. His velocity was called projectable, his size was called "mature-bodied". He wasn't quite sure how to take that description! He considers his dad mature-bodied while I apply that description to a good glass of wine! Or is that full-bodied? Could be the same on my husband (and me for that matter)!
My son has never lifted weights, but has a solid lower half. If you are over 6' and/or have good velocity, plus you can throw muplitple pitches for strikes, colleges are more than happy to see what they can do with you! The college workout hopes to produce a developed body when you're a bit older and they get you on campus full-time. Everyone grows at different rates.
Before anyone has a fit, being over 6' isn't required, but the coaches know they can't teach height or left-handed. That's a plus for a pitcher that is out of everyone's control.