So long to non-padded practices, touch tackles and half-speed drills.Michael Crabtree's offseason Achilles' tendon tear pushed Anquan Boldin into the No. 1 wide receiver spot. Who's No. 2?Colin Kaepernick was unstoppable as a read-option quarterback at times last season, but can he be just as effective as a pocket passer should defenses hamper his opportunities to run?