I would. Pierre (if healthy) should get alot more touches and put up alot more consistent numbers than Barber. And Colston is a way better fantasy WR than Ocho. I wouldn't even worry about them being on the same team. I like that trade alot.
This one's a toughie. Barber at his best is better than Thomas. Barber must share carries with F Jones and Thomas with R Bush. Who will get more touches? At his best Ocho is better than Colston but without Housh there he'll be getting double treamed more this year. Unbless you have Brees as your QB and can pull off the trifecta I wouldn't do it, all things considered
QB - M. Schaub, J. Campbell RB - K. Smith, D. McFadden, C. Wells, D. Brown, G. Coffee, J. Davis WR - R. Moss, C. Johnson, C. Ochocinco, C. Henry, J. Morgan, E. Bennett K - M. Prater DST - Chargers, Packers