Brown led the league in receiving yards last season (1,533) as part of the league's No. 3 offense.
The absence opens up opportunity for rookie receiver James Washington to get more reps and make a larger impact as he acclimates to the NFL and attempts to work his way into a role within Pittsburgh's offense. It also adds importance to the other receivers down the roster -- Eli Rogers, Justin Hunter, Darrius Heyward-Bey -- to be prepared in case Brown's injury is more serious than anticipated.
With little information known on Brown's injury (Tomlin wouldn't even specify the body part), it's too soon to make one strong point or another. Check back when we know more.