In Tony Paul's podcast with Avila he asked him about Jobe and Al mentioned JV's starts in 2005 when he had all this off the chart stuff but still got hammered by MLB hitters.
Just for comparison, between college and the minors JV had thrown 450 innings prior to 2006. Jackson is at 252 IP since he left HS - that's pretty green even for a guy with great stuff. OTOH, that's about where Skenes was before last season - but Skenes is a freak even among the freaks that make up the MLB pitching population.