ugot,
I do not remember anyone on The SignOff 2 who looks anything like Nakia, age 36 and from Austin TX (who sang Celo's song). Here are the 10 groups that competed on The SignOff2 a cappella group copmetition:
The Backbeats
Los Angeles, California
a cappella singers from the University of Southern California and the University of California Los Angeles, this group of 5 male and 5 female 20-somethings incorporates their disparate styles and tastes into one synthesized sound, fused together by their love of pop, R&B and soul
Eleventh Hour
Kettering, Ohio High School
the youngest group in the competition, 4 females and 3 males
Pitch Slapped
Boston, Massachusetts
music teachers and students from the Berklee School of Music, 7 males and 5 females
Groove For Thought
Seattle, Washington
a jazz/R&B group with a father/daughter duo included, 2 females and 5 males
Men of Note
Cherry Hill, New Jersey
8 males with sports backgrounds, graduates of Cherry Hill High School West
Street Corner Symphony
Nashville, Tennessee
6 males doing country western and R&B type styles
On the Rocks
Eugene, Oregon
15 males
Committed
Huntsville, Alabama
6 males doing gospel style
Jerry Lawson & Talk of The Town
Oakland, California
Jerry spent decades with the Persuasions and it making his comeback as the lead singer with 5 other very talented, smooth singers
The Whiffenpoofs of Yale
New Haven, Connecticut
12 males from the original a cappella group in 1909
I double-checked video of Street Corner Symphony, which has 2 guys who look vaguely like Nakia, but there is no match there.