I don't know who Ricardo's challenger is, at first I thought it might be Miyata, Wali, or Vorg trying to conquer another weight class, but the fact he delayed Sendo's fight for this must mean it's someone much more important than that, I doubt it'd be Gonzales though.
It's nice to see other boxers still miss Ippo in the ring, Imai is still upset about it, he doesn't seem to consider Itagaki his rival anymore btw, he's on a completely other level. It's sad that Itagaki got sidelined so hard he doesn't look half as strong as he was built up to be.