The best situation you have with Dunlap is that you keep him this year, but cut him next year. Cutting him this year results in a hit of 9.3 million dollars (on top of the money you're now adding for Tunsil). Next year he costs 8.3 million and the cost to cut him is 3.2 million, but that makes the real question, what do you do with Tunsil this year? Do you really just sit Dunlap?
I don't think Dunlap means you can draft Tunsil, I'm just saying it isn't a great fit for a team that went 4-12 last year and the 21st ranked defense in the nfl (ppg) versus a team that threw for 4591 yards, who's qb had a 94.5 qb rating. I just don't think he improves that team like he does ours.