I'd use the term sleeper loosely. He's probably going to start Week 1 but I can't imagine that lasting. Once Brown gets healthy, he's likely to be in there next to Daryl Smith/McClain. He's worth a look as a couple week starter in deep leagues, but be prepared to dump him.
do a little more digging on this one guru, from what im reading and have heard from harbaughs interviews, Brown has been good to go sense the start of camp, bynes has simple beat him out . it way not last but its not due to injury
Still not buying it sticking long term. Brown has been playing in subpackages during the preseason which is rare for a rookie. This signals to me he's got a fairly good grasp on the playbook and the coaching staff trusts him already to a certain degree. I'd not saying necessarily buy low on Brown, I'm just not sold on Bynes outside of a couple week stopgap.