I don't think anyone here considers Butler to be the second coming; besides, Jesus was a carpenter, not a shutdown corner.
I think people here just want to see what the team has. Is Butler serviceable? If so, then the team has something to look forward to. If not, maybe he doesn't deserve a roster spot. This team invests in a lot of "developmental" picks, very few end up developing into something decent. If Butler shows that he has an upside it would be nice to see. We know that CB is an area that this team needs to address; BMAC, Gay, Lewis, and Madison are not the answer. Trial by fire, see if he can be an asset.
I agree, although a high stakes game would not be the best timing for lengthy PT, some spot duty when Ravens are in their own end may be suitable.