There are a pair of Johnsons that rank among the very best receivers in the NFL. After Week Four, their seasons hit a fork in the road. Lions WR Calvin Johnson, who has had moments in his first four NFL seasons, is becoming unstoppable this year, scoring two more touchdowns against Dallas, the fourth straight game in which hes scored two touchdowns. Johnson has twice registered a dozen touchdowns in a season, a mark that now seems inevitable to be broken this year for a new personal best, provided he stays healthy. Its too soon to get excited about it, but the single-season NFL record for receiving touchdowns is 23, set by Randy Moss with the New England Patriots in 2007. Moss and Jerry Rice (with 22 in 1987) are the only receivers to ever have more than 20 touchdowns in a season. Houston WR Andre Johnson, on the other hand, suffered a hamstring injury and it should keep him out of the lineup, at the very least, for Week Five against Oakland. While Johnson is sidelined, that will mean more balls available to TE Owen Daniels as well as wide receivers Jacoby Jones and Kevin Walter. Ultimately, it probably hurts QB Matt Schaubs value because none of those receivers is near Johnsons elite level. On a more positive note for the Texans, RB Arian Foster returned to the lineup against Pittsburgh and ran for 155 yards on 30 carries; apparently his hamstring is just fine now. INJURIES- Steelers QB Ben Roethlisberger has a sprained left foot and that could keep him out of the lineup, which would have a negative impact on receivers Mike Wallace, Hines Ward, Antonio Brown and Emmanuel Sanders, but could also affect Rashard Mendenhall, since defences wont give Charlie Batch the same kind of respect in the passing game. Considering the troubles that the Steelers are having along the offensive line, combined with Mendenhalls mediocrity this season, the Steelers arent in great shape as they host Tennessee this week. - Steelers OLB James Harrison suffered a fractured orbital bone that is expected to keep him out for multiple weeks. Jason Worilds would be favoured to take over Harrisons pass-rushing duties, but he suffered a quad injury against Houston too, which could mean more shuffling for Pittsburghs defence. - Dolphins QB Chad Henne suffered a separated shoulder against San Diego, an injury