It's not exactly ideal, but i feel like an all-star DT with Johnson next to him is more likely to bring positive results than bringing in an all-star DE with Lewis next to him.
From a previous post it looks like you think Brayton is actually the weak link in the Brayton-Johnson equation. Brayton didn't get a lot of sacks but i thought he performed fairly well. He disrupted a lot of plays and played the run well. If a new starter was brought in i have a feeling that Brayton would still be starting on one side with Johnson continuing to come in on passing situations.
There's no question that we're going to bring in another DE somehow, but if we're going to go out and start doing trades or looking for high-price FA's like some people wanted to do to fill positions, getting a monster DT should be the move that defines our offseason. I do agree with a lot of people that if those moves all come down to the draft, with the first rounder we get for Peppers and our 2nd rounder, we should pick the best available players between DT and DE.
I also agree with you even though we have 2 starter at DT. 1 (being Lewis) is really at his best coming off the bench. Maybe it was just me but he lost steam and push at the end of the season. Really both of our DT are specialist. Kemo good at the run bad in pass rush and Lewis good at pass rush bad against the run. People may hate too hear this but we need another Jenks good at both who can play all downs. Moving lewis back too his role as a interior pass rusher. Don't get me twisted either we do need a DE if Pep is gone. Really this whole offseason should be about the D. I would be happy with a new starter at DT CB and a new DE if Pep is gone.