Where is Scar?

I could use a little help please:
So, I'm in the big city now. At the gates Scar gave me that "Seven Suns" quest. When I came to that area later I went to the Flaming Fist HQ first. Talked to him a bit inside, he went out, talked to him a bit outside, he presented me to Duke Eltan who gave me another quest...
Now Scar seems to have disappeared. I've dealt with the Seven Suns now but can't find him anywhere to finish the quest. Looked everywhere inside and outside of HQ, maybe close to Seven Suns, maybe close to Iron Throne, maybe back at the bridge, but no Scar... where might he be?
So, I'm in the big city now. At the gates Scar gave me that "Seven Suns" quest. When I came to that area later I went to the Flaming Fist HQ first. Talked to him a bit inside, he went out, talked to him a bit outside, he presented me to Duke Eltan who gave me another quest...
Now Scar seems to have disappeared. I've dealt with the Seven Suns now but can't find him anywhere to finish the quest. Looked everywhere inside and outside of HQ, maybe close to Seven Suns, maybe close to Iron Throne, maybe back at the bridge, but no Scar... where might he be?
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He should either be inside or in front of the FF headquarters, depending on the quests you have done for him and Eltan
Are you sure that you finished the Seven Suns, that is, were you in the basement, too?
Checked back at the HQ 3 times now to see if maybe Scar's presence there might somehow be tied to daytime or something, but no matter if day or night, no Scar, just Tiax, and a bunch of commoners by day (also checked the 3 floors inside of course)...
I hadn't done one single quest for him before that, that's what I found so irritating because IIRC don't you get another quest from him after the Seven Suns affair?
Edit: could it be that he's maybe somehow just "gone for a while" and returns if I clear the Iron Throne building for Eltan or so?
Anyway, thank you all for your help!
OK, there's some treasure to find in the Seven Suns basement and the sewers - but nothing unique, and you can go there anyway.
Good to know that nothing really "important" was lost, that's comforting, so thanks again!
But still, even if this might not strictly be a "glitch" per se, if some of the devs might read this, maybe something worth fixing for that upcoming 2.6 thing? Doesn't seem to make too much sense that Scar leaves the game even with all his business "unfinished"
I encountered a comparable issue during my first playthrough when I went into the Iron Throne building for Eltan. No spoilers as I don't know how much you know, but I'd recommend not going back to Eltan to report until you've seen everything you want in that building. I went to him for an update on the investigation before going to the upper floor, and the quest ended and a certain event triggered that made it impossible to go back. Keep that in mind when you go there.