I've heard multiple stories around New England and Dartmouth that True is/was three things:
1) Insanely talented - The AZ 4:02 mile story was like 2 weeks after ski season ended. Supposedly True would gain 15 pounds or more every winter for ski season, mostly upper-body.
2) Very driven and focused - the guy never even once drank in his 4 years there, I've heard that from two different Dartmouth runners.
3) Really humble and genuinely nice - I witnessed this first-hand when he was a high-schooler, and people who know him say he deserves the success. I was just a dad at a small meet, but the kid was a very gracious winner.
This is NOT the profile of a doper. Admittedly, people can change, but I find it highly unlikely.