Should i trade doug martin for kelvin benjamin in half ppr? i also have mike evans tough to trust both buccaneers come playoff time?

You obviously haven't been using Martin until possibly this week, but he still may be better than the other RBs you have. Benjamin is a low end #3 fantasy WR so far. Benjamin plays Washington and Atlanta weeks 15 and 16. The Atlanta match up is particularly good. Martin has Dallas and NO a bad match up and a very good one. This really depends on who else you have on the roster and rather you'd be likely to play either of these guys during the playoffs. It' not an unreasonable move to make, but I wouldn't base it on not wanting two Bucs during the playoff weeks.