Yes he'll have input. But he won't have the same pull on decisions that someone like Jim Harbaugh, Andy Reid Pete Carroll other more established coaches would have.
Ultimately the decisions on personnel will be Ryan Poles judgement.
Let's not kid ourselves that there will be a massive change in the roster just because Johnson is here. I take nothing away from Johnson but there are coaches that have more influence.
Again though things are so bad on both lines they're not going to be fixed in one off season.
I think everyone agrees that the focus has to be on the trenches this offseason - for really real this time.
If Trey Smith really hits FA, he has to be the #1 target of the Bears.
I would expect Josh Sweat to be a target as well for the DL.
I would expect their focus to be OL and DL in the first 2 days of the draft.
The Bears 100% have the resources available to address both the starting OL and DL this offseason - should they choose to do so.
Now, I specifically am saying they have the resources to address putting together a vastly improved starting OL and DL. IMO, they don't have the resources to rebuild the entire thing including depth. But they can definitely make the moves to have a viable starting OL and DL.
IMO, no team ever has the depth they want across the board. Staying healthy is always critical to a team's success. Hell, a large reason why generally speaking half the playoff teams change every year can directly be tied to injuries and lack of depth. Very few teams are able to withstand losing key starters for long stretches of time.