Why does it say here "Min ha'Sheloshah Hachi Nichbad", and in Divrei ha'Yamim I, 11:21, it says "Min ha'Sheloshah va'Shenayim Nichbad"?
Radak: He was of the three [who brought the water] and was more esteemed than the other two.
Malbim: He was most esteemed of the latter 1 three [who brought the water], but was not one of the first three Giborim.
It seems that Malbim expounds "va'Shenayim" like va'Sheniyim. (PF)
Why does it say both "Hachi Nichbad" and "va'Yhi Lahem l'Sar"?
Radak: The matter is doubled, to strengthen it.
How can it say both "Min ha'Sheloshah Hachi Nichbad" and "v'Ad ha'Sheloshah Lo Va"?
Radak: He was most esteemed of the three [who brought the water, but he was not one of the first three, i.e. Adino, Elazar and Shamah. He did not reach their Gevurah.