Defcon*.
But yes, I think he would be capable of being a front-line figure. To be honest, the Defcon account has always struck me as being peculiar. His initial introduction seemed strange, it was as if there was some underlying reason that he had to be known to the community - despite not having a public role in the SR team.
I'm trying to avoid putting on my tin hat, but I have a feeling Defcon is merely an alias for DPR to slip into to create the illusion that DPR had jumped the gun.