When offensive right tackle Ed Simmons injured his neck during the first quarter Sunday, a familiar figure was pushed back onto the field for the remainder of the day.

Joe Jacoby had played only in short stretches until then, but he finished the final three quarters against the San Francisco 49ers, got generally high marks and showed the Redskins again what an amazing recovery he has made from reconstructive knee surgery.

The Redskins say Simmons likely will be back in the starting lineup Sunday against the Dallas Cowboys at RFK Stadium, but if there were any lingering doubt about Jacoby, it was erased against the 49ers.

"It's fine," Jacoby said. "I'm not even wearing the big brace anymore. I'm wearing the one I've worn for years, so I don't even think of the knee. I made some good plays and some bad plays. I wasn't as consistent as I would have liked, but it was great being back out there."

With Jim Lachey established at left tackle, Jacoby said he expected to continue sharing time with Simmons, saying: "Ed has proven himself. He deserves to be in there and I think I can still contribute. My feeling on that is I'm just happy to be back after last year."

Developmental Squad?

General Manager Charley Casserly spent much of yesterday lining up candidates for a five-man developmental squad in hopes that NFL owners will approve it during a vote next Tuesday.

Casserly said players from the Redskins' last round of cuts would be the most likely candidates for the squad. He wouldn't name names, but offensive lineman Tim Moxley and wide receivers Paul Smith and Percy Waddle would be candidates.

"We're in favor of it and I'd think there'd be 21 votes for it," Casserly said. "We think it'd be a real positive move. It won't have as big an impact next week because your players on injured reserve can return to practice after four weeks. It's still the concept that's important."

Zone Defense

Mark Rypien said one of the lessons the first two games has taught him is that teams fear The Posse so much that they're playing mostly zone coverage. That means they're giving away the short routes to keep the Redskins from connecting with the long pass.

"Teams are more willing to give us the underneath stuff and we have to start taking it," Rypien said. . . .

Receiver Gary Clark said that when Dave Waymer pulled him down at the 1-yard line to prevent a touchdown in the third quarter on Sunday, it was the best proof possible of how much his strained hamstring is bothering him.

Clark is probable for the Cowboys game, but it's clear he's not enjoying playing at less than 100 percent. "It's sore, but I've played with worse," he said. "The only problem is that I can't run fast. I'm going to give it a try and see how it goes." . . .

Redskins officials say that defensive end Charles Mann, who was roundly roasted by CBS on Sunday, had a better day against 49ers tackle Steve Wallace than it might have appeared. They say that not only did Wallace hold Mann several times, but that he once grabbed his facemask and pulled him down.

"It's grotesque-looking in the films," Mann said. "But the thing that really got me was the way he was getting his hand inside my facemask. The first time he did it, I said, 'Hey, watch that.' He said, 'I'm sorry.' Then he did it again and said, 'I'm sorry.' I complained to the officials and they said at halftime they'd watch it."

Mann said the first time Wallace got inside his facemask in the second half, "I slapped him. We had a little skirmish and it didn't happen again. My wife told me {commentator} John Madden was pretty rough on me, but there's nothing I can do about that. I'd just like to see the 49ers again this year. I'd like another shot at the 49ers, Steve Wallace and John Madden." . . .

Linebacker Monte Coleman (hamstring) missed all of practice but is listed as probable. Cornerback Alvoid Mays twisted a knee, but is also expected to play.