Answer to Question 1
Syncopation (or misplaced accents) refers to accenting beats that are normally unaccented or accenting notes that occur in between the beats. (If you read music, notice in TR. 4-11, Worlds of Music, p. 206 that the syncopated words always fall between the regular beats of a 4/4 meter.
In stanza 3 of Poor Boy Blues Lucas syncopates
. . . age . . . a-round . . . been a poor boy. . . ain't caught. . . hell.
Answer to Question 2
No, Lucas sometimes sings in a duple (two-meter) against the triple/compound meter of the accompanying guitar and drum.