2 Chronicles 26:23 (ESV) reads:
And Uzziah slept with his fathers, and they buried him with his fathers in the burial field that belonged to the kings, for they said, “He is a leper.” And Jotham his son reigned in his place.
Overall, it sounds like the passage is saying that Uzziah was buried with the other kings ("with his fathers in the burial field"). But the "for they said" clause then seems out of place. Still, there's nothing here that I can see explicitly saying that Uzziah was buried apart from his fathers, and several statements saying he was buried with his fathers.
Nonetheless it's apparently common to interpret this as Uzziah being buried separately from them. The Reformed Study Bible says:
Uzziah was buried away from the royal family in relative dishonor because of the curse of leprosy.
The Moody Bible Commentary says something similar ("Uzziah was nevertheless buried... near... but not actually with the other kings").
Can this understanding be defended on the basis of this verse in and of itself? Or does it rely on other passages that more clearly define a) where kings were buried or b) what was done with lepers? How so?