Johnston was a second-round pick for a reason. But we could go back to using the fullback much more if Luepke is a better option than our backup tight ends. Right now, with Schoonmaker nursing another injury especially, that would appear to be the case. When we are not in three-receiver sets, there's a good chance we will be in 21 (two backs, one tight end) instead of 12 (one back, two tight ends), especially if our running game is geared toward running between the tackles (which seems to be what our running game coordinator and OL coach prefer).
Not saying in any way that Luepke is going to get a bunch of touches per game, but he could receive a dive or two and a pass or two if he's out there more than the second TE.