The mental part of the game is a major adjustment for all players. The last thing is the physical schedule is nearly twice as demanding in the NFL than it is for the college boys. Sure, something is lacking. You miss it, you wish you had won the championship, that's the first goal after making the team. No, it's up to the individual and a good analogy would be Greg Norman's golf career to this point.
Pro football takes a lot of turns.
After winning a championship one season, naturally you want to win it again. It hurts when you lose, however if you're not realistic about the team concept, you could feel bad for a long time. We had an outstanding team after we won the Super Bowl, and we lost in the playoffs to the Chiefs. A loss that physically and mentally hurt for a long time. But it's better to have won at least once than not at all.