SANTA CLARA -- Stevie Johnson is the favorite to see the most action as the 49ers' No. 3 wideout this season. So when he lost his footing in Wednesday's practice at Levi's Stadium, it wasn't too surprising that triggered Jim Harbaugh to order his team off the maligned turf.
Johnson appeared to jog off whatever leg or ankle injury he incurred, and the 49ers surely will need him when they deploy more multiple-receiver sets this season.
Johnson predicts the 49ers' offense will be "pretty dynamic," even if it has been pretty dormant through two exhibitions.
Johnson arrived in a draft-day trade as one such asset. Rookie wideout Bruce Ellington quickly has garnered praise from Harbaugh. Add in the reincarnation of Brandon Lloyd's career and the 49ers have enough complements to starters Anquan Boldin and Michael Crabtree.
"I'm pretty sure everybody already knows the bulk of it will be with Crab and Boldin, so we're just fitting in right after that," Johnson said.
"It's all about how does that matchup against a particular team," offensive coordinator Greg Roman said. "We haven't lived in the three wide-receiver sets like some have."
Two more exhibitions will give way, however, to meaningful football for a 49ers offense determined to feature more playmakers.
Johnson said coaches are "doing well at mixing up" the rotation of wideouts when they go to multiple-receiver formations. Perhaps the quickest of that receiving corps, Johnson isn't being introduced to strictly one position, as he's taking reps at multiple spots, as is the 49ers' norm with all of their wideouts.
"Whenever you get your opportunity, make it work," said Johnson, who reached the 1,000-yard mark in three of his past four seasons with Buffalo. "We have a lot of good players that can make plays. Not all can be on the field at once."
Roman noted that the 49ers historically have split out Vernon Davis and other tight ends. "I like where our wide receivers are," Roman added. "They're working hard, and there's a good chance that you'll see more of them."
"I've made some mental mistakes but I'm getting better," said Moody, a 2013 sixth-round draft pick whose case is bolstered by playing on all four punt and kickoff units. The 49ers thought enough of his potential last season that they used their lone injured-reserve/designated-for-return tag on him after a Week 1 fractured hand.
Moody plays strictly the "Jack" linebacker position, where Patrick Willis lined up at the past three years next to Bowman. Willis will shift to the "Mike" role if Wilhoite beats out Borland, a third-round draft pick who has been groomed at "Mike."
"We've got some history with Josh and I feel really good about that," Roman said. "A couple things happened in the games he'd like to take back, maybe do over."
Johnson, battling to unseat Blaine Gabbert for the No. 2 role, was cut after the 2012 training camp. Roman noted that although Johnson's opportunities have been limited in the exhibition games, the practices have served "as a good barometer."