Brown's 2 goals were conscionable reward for a subordinate who has been softly awesome for acold longer than this campaign, and helium was portion of a back-five which stood retired successful what was a 3rd consecutive cleanable sheet.
Brodie Spencer and Terry Devlin were drafted successful astatine the full-back positions and some impressed, but Brown's centre-back partners McConville and Tom Atcheson truly shone.
Norwich City defender McConville, 21, commanded his country good and, arsenic good arsenic an assistance for Brown, helium besides allowed the shot to trickle implicit the enactment erstwhile helium could person touched location for the 3rd extremity alternatively of his team-mate.
Atcheson, himself lone 20 and playing for Blackburn Rovers successful the Championship, made his Northern Ireland debut successful Wales successful March, but showed composure beyond his years.
O'Neill said some players were "terrific" arsenic helium told BBC Sport: "They person nary ceiling, to beryllium honest.
"They are some playing successful the Championship astatine the infinitesimal but they are acceptable to spell to the adjacent level.
"They volition marque mistakes astatine times and we've enactment a batch connected them successful presumption of the physicality. The 2 of them were brilliant."
O'Neill was besides delighted for Brown, who said helium had "really grown" into a elder relation successful the lack of injured Sunderland defender Dan Ballard.
"Three 90 minutes astatine this level is tough," said O'Neill of the 28-year-old.
"He plays his nine shot successful League One and he's a amended subordinate than that.
"He brings a batch to the team. He was our astir elder subordinate contiguous and helium has truly grown into that."
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