This is the same silly response this /a/non ALWAYS sees in response to "why the hell hasn't Lulu killed Suzaku yet now that he can with no problems, and it makes even less laughable sense EVERY time I hear it.
How is having your number one enemy and the person who has pretty much single-handedly ruined every victory you've had so far a BAD thing for Lelouch?
Who the fuck cares if Suzaku dying would "leave questions"? EVERY fukken thing Lelouch does leaves questions. He's parading around on international TV, re-inciting the rebellion, killing the Governor General of Japan, waging war, decalring the Unoited States of Japan. What would one more "suspicious" act be at this point, and no more suspicious then anything else he's altready done. Likewise, it would be obvious to the Emperor and co., who ALREADY know Lelouch has his memories back anyway, that ROLO killed him and not Lulu.
There's a million reasons why having Spincracku killed right now is the most awesome idea on the planet and not one other then bad writing and "because then the story would just end" to support him NOT killing Suzaku.