It's absolutely difficult to judge kickers when you haven't been a kicker yourself. But Nick Jordan's talents are such that he stands out even to the average observer.
First of all, it's important to note that Jordan will be a kicker, likely not a kicker/punter, at the next level. And he's good enough to make the specialization stick. He's accurate on his field goals, has a smooth motion that makes you think he could boot 200 balls without getting tired, and has the range to connect on longer kicks.
If there's a reason he isn't listed as an elite kicker in the class, it's simply that he doesn't get the hang-time on his kickoffs that some other kickers do. But with Texas bringing in other players to handle those duties, it shouldn't be a major issue. And it's not that Jordan is bad on kickoffs. He puts the ball consistently into the end zone and shows a powerful leg. He's just not quite elite in that area.
The other, and perhaps most important part, is that Jordan is a tremendous clutch kicker. Earlier, I mentioned his smooth motion. And it stays that way even in pressure situations. He's wonderfully consistent in that area, meaning that it's difficult to tell the difference between an early-game 25-yarder and an end-of-game 45-yarder.
The Longhorns have had success with their kickers, especially in the clutch, in recent years. And in Jordan, Texas appears to have found a kicker who will be ready to kick in big situations from the moment he arrives on campus.