KRISTOPHER SKINNER Contra Costa Times Josh Morgan, left, will start at wide receiver with Michael Crabtree. It's a pairing the 49ers had in mind when they drafted Crabtree. SANTA CLARA San Francisco wide receivers intent on holding on to their jobs might want to keep the tips, advice and tricks of the trade to themselves. Last month, Josh Morgan helped recently arrived Michael Crabtree learn his position, then watched as Crabtree took his starting spot.