All three (Dickerson, Faulk, James) were great but I think Edge was the best Colt (Indy Era) because he was a primary cog in Peyton's legendary offense. Not to mention he was well on his way to a third straight rushing title until he got hurt. Regardless, he rebounded from his injury and forged a hof career.
Check out the trade Jim Irsay made as GM to land Dickerson.
Per Sports Illustrated:
"Three teams were in on the Dickerson deal, which involved a damnably confusing realignment of talent, the repercussions of which are sure to affect the league for years and years, or at least until Mark Gastineau's next sack. The mastermind behind the blockbuster was Jim Irsay, the 28-year-old general manager of the Colts, who also happens to be the son of owner Robert Irsay. Follow this: Indianapolis traded the rights to rookie linebacker Cornelius Bennett, a No. 1 draft choice out of Alabama whom it had not been able to sign, to Buffalo for running back Greg Bell and the Bills' first-round draft picks in 1988 and '89 and their second-round pick in '89. The Colts then sent all they'd received from Buffalo, along with their own first-round draft pick in '88, their second-round choices in '88 and '89 and running back Owen Gill, to the Los Angeles Rams, who in turn packed Dickerson off to Indianapolis."
It's also worth mentioning that he gave Seattle two first-round picks for Freddie Young a year later. That's three straight 1sts and two straight 2nds between 88-90 for five years of Dickerson and a bust at linebacker. lol