Should i drop Brandon Roy to pick up Cpi or Green?

i join a 20 team league. im the last to pick come draft time. psyched i get Brandon Roy. then BAM critical injuries developing. im thinking about picking up Willie Green or Omri Cpi. im 14/20 now, may be a little desperate but i dont want to find out later Willie Green or Cpi is playing studlike or something and i missed my chance to get him while Brandon decides to call it a season. waddya think???