Is there something in the new chapter indicating this?
Besides, just capturing Boa alone and not any of the other warlords in also equally as bad. Fuji's strength portrayal doesn't take a hit due to this too. Cause it was the SSG that were supposed to compete with the warlords. Unless Fuji clashed with a warlord and they still escaped of course.
So, having Boa be the only captured warlord would be plot contrivance just so ooda could show that SSG or Fuji did something
In conclusion, Boa is not captured. Coby could never