Are you talking about Tony Casillas here ? They didn't draft him, they traded 2nd and 8th round picks to Atlanta for him.
I mean, let's not kid ourselves here, they had a ton of talent, though all young. Irvin was taken 11th overall in 1988, Aikman #1 overall in 1989, and all three are in the HOF. But they weren't perfect, either. Blew the #1 overall pick in 90 to take Steve Walsh in the supplemental draft, with the top pick of the second round that year they took Ace Wright who ended being nothing but a special team's player, and Russell Maryland #1 overall was good, but not top pick in the draft good.
At some point, when you have the #1 overall pick in three straight drafts, you have to amass some amount of high level talent.