It was better for Flacco to take the fall against Flores' defense. It would have been even uglier with Richardson out there.
Indy is in the middle of a tough stretch. Bills, Jets and Lions are the next three. After that, they end the season with the Pats, Broncos, Titans, Giants and Jags. I could see them throwing Richardson out there to end the season against those five teams. They have a bye after the Pats game too.
Look at that video
@GilSho posted. Richardson is completing 28% of his passes against the blitz and that's all Flores does.