Like everyone else in the Black Butler manga fandom, ch 169 is making me think about the identity of Lord Polaris. And like many, I'm speculating that perhaps Polaris is Joker. @midnight-in-town makes a very clear argument for Joker as Polaris in this post. I agree with a lot of the evidence I've seen posted but wanted to add few little bits that I haven't really seen discussed much...
Real Ciel makes a point of reminding Polaris that he is no longer Lord Sirius and that that title now belongs to his brother.
This is obviously because they've been framing our Ciel as the ring leader of the Sphere/Blue Sect crimes so they must keep their story inline. But, could it also be a reminder because Lord Polaris once knew our Ciel by a different name, Smile and hom using that name might give away too much?
I also noticed how frequently Polaris's hands/arms were a focal point (see above images and below for some examples) and how awkward his left arm looks in this panel below:
The hand and wrist here just doesn't look natural. In fact the wrist looks a lot like a prosthetic. Plus, he is wearing gloves that disguise his hands. We know that Joker lost both his hands/arms after the circus arc and that he is very skilled at using a prosthetic hand. So the idea that Undertaker either attached new arms onto Joker (eww awkward) or created new prosthetics for him is not a big leap and might explain why when Polaris was able over power Angi's strength.
Finally, I recalled the scene from ch 116 where Nina is discussing making four outfits for the Star Lords. This is one of the first references to the Star Lords in the manga.
The one on top has always looked like a silhouette of real Ciel to me and him being on top implies he is Lord Sirius. I've often speculated that this image has more clues about who the Star Lords are beyond this. Things like there are only four figures, leading me to believe Vega might be only one person. And when I look at it with the thought of Joker possibly being Polaris I noticed the figure on the right has both hands obscured. They are also standing to real Ciel's right side in a position with very ridged posture like that of a trusted butler.
