Waiver wire help standard league!

Should I pick up Ty Hilton? Standard league. 2 WR, 2 Rb and 1 flex

My line up is
QB: Tannehill, Lamar
RB: Drake, Dobbins, McCaffrey, Harris, Gibson, Hunt and Mixon
WR: AJ Brown, Jefferson, Claypool and McLaurin

If I do pick him up who am I dropping?