Horton didn't have a bad career by any means, but it was cut short due to a long list of injuries. Prior to selecting Horton though, the Panthers tried multiple times to select Alex Ovechkin. Ovechkin would have been eligible for the 2003 draft had he been born on or before September 15, 1985. Unfortunately, he was born on the 17th meaning he would be eligible for the 2004 draft.
The Panthers, however, believed Ovechkin should have been eligible for the 2003 draft. Why you ask? Well the Panthers attempted to use the argument that Ovechkin would've been eligible for the 2003 draft had the league taken leap years into account. Imagine if the league sided with the Panthers and allowed them to draft Ovechkin? How different would the league look now had Ovi been a Panther? It's also worth noting that Ovi may be even closer to Gretzky's goal scoring record had he been drafted in '03.
Had the league sided with the Panthers, it also would have had implications for future drafts and we probably would've never seen the Crosby vs Ovechkin rivalry in the Metro Division either. Still, it's fun to think about what might have been.