This series could have used a single extra volume to spread this arc out a bit. The ending feels so rushed compared to the rest of the series, where the pacing was spot on.

I'm happy with the ending, but closing so many things in often a single panel each (Motoko's biological father, Sora, the fate of Motoko's family, the whole colors thing, etc) is weak. To use one of those examples, they hyped up the colors (red, blue, yellow, black, which is the strongest?) for volumes and end it with Botan stating twice how surprised she was the straight Red can beat Black no problem (therefore their philosophy of endlessly striving for Black is meaningless).