You're not going to be able to please both sides here. Do what you suggest and then Team Wilson considers the process to be railroading (see: Angela Corey/Zimmerman). Look at the skepticism that resulted from some when DOJ stuck their nose into this mess for an example of how an ostensibly detached/impartial agency isn't perceived as so. Who do you want to please more? Even without a special prosecutor, any indictment is still "justice" to one side and "railroading" to the other; alternately, a failure to indict is "justice" to one side, and "systematic racial bias and a lack of police accountability" to the other. Such is life.
@Mr. Haggard
I never stated that the assault at the car and the following seconds are unrelated. I'm really not sure where you're getting that from. I did say that the state of mind that Wilson was likely in ("this guy wants to kill/seriously injure me -- he just tried to do so") alone is not enough to justify what happened later. It will certainly play into how reasonable Wilson's perception of an act by Brown may have been, but there's still that requirement that Brown acted -- which, despite the trickle of information that appears calculated to influence public opinion, hasn't been conclusively spoken for in the public sphere thus far.