A double-double machine, the 6-foot-9 forward has helped the Dragons' offense motor along, regardless of the defense.
"He's the bus driver," GFA coach Doug Scott said Monday. "You either have to invest in stopping him and it frees everyone else up, or you can attack him ... and he'll destroy you."
In Sunday's Class C New England final, No. 3 Pingree School (Mass.) chose to throw double teams at Obi, leaving top-seeded GFA to turn to another viable option on offense.
The Rice University-bound Obi had 10 points, seven rebounds and five assists.
"That's been our key all year long," Scott said. "Sean's been so dominant, the other team has to come up with a plan to throw extra bodies at him."
Baines, who also filled the stat sheet with three steals and two blocks, received game MVP honors.
"He was just energy all night long," Scott said.
Senior guard Hunter Eggers scored 12 points, while Matt Tate had eight points and five assists.
Up 27-17 at halftime, GFA held on with some clutch free-throw shooting to win its 18th straight game. The Dragons, who won their first Fairchester Athletic Association title on Feb. 23, finished the year 24-2.
Scott praised his team's defensive effort in the half-court.
"Defense for me has always been athleticism and attitude," Scott said.
The Dragons finished the year averaging 72 points per game, with all but two of their wins by double-digits.
"It really has been a dream now for about three months," Scott said, "and the alarm clock is about to go off. It hate for it to end."
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No. 1 GREENS FARMS ACADEMY 55,
No. 3 PINGREE SCHOOL 50
Johnny Spears 7 3-4 19 Nino Leone 1 0-0 2 Justin Assad 4 1-2 9 Connor Reardon 2 0-0 4 Kyle Lentini 5 2-5 13 Reese Fulmer 1 0-0 3. Totals 20 6-11 50.
PINGREE 17 33 -- 50
GFA 27 28 -- 55
3-pointers: P -- Spears 2, Lentini, Fulmer.