Another Video of the Possible Baltic Gull

Going through the video of the adult Baltic Gull candidate I found on Saturday, I noticed this section of video. As you can see a couple of intermedius LBB Gulls sail past it on the water and you can clearly see it is blacker than them on the upper parts. On a normal day they would stand out as being distinctly darker than the graellsii LBB Gulls.

Also look how long its wings are.