mrkgnao: That's always been the case. Judas's pre-admin posts are indeed not blue.
IAmSinistar: I suspected as much, but my memory can be unreliable at times. Though I suppose it's still possible that account elevation (from User to Admin or Developer) still creates a sort-of new account from the system's perspective, such that posts are tagged at that level.
All just forensic speculation on my part. I like to try to guess what's happening behind the curtain, so to speak.
It's similar, I think, to another phenomenon, whereby if you reply to someone's old post from a period when that person had a different avatar, the avatar shown alongside your reply is the old avatar, even though the new avatar is the one shown with the post you had replied to. Basically, I believe there is some "cached" information kept with each post, which is independent from the current global information.