Najee for CMC?

10 team full ppr 3 wr 1 flex. I am 7-0 and hesitant to mess with my team. Rival team in league is in last place huge Steelers fan wants Najee bad. Do I give up Najee for Hubbard and McCaffrey? Do I ask him to throw in Pittman Jr?

Roster
Dak
Zeke
Najee
Gaskin
Pollard
Gainwell
Hockinson
Gronk
Cee Dee
Kupp
Deebo
Lockett
Claypool
Toney

He has
McCaffrey
Hubbard
Jefferson
Pittman JR
Diontae Johnson