I think they're grooming him to succeed T-Rich in a couple of years, although Richardson looks to be in tip top shape, he's aging like a fine wine.
Caulcrick was not known as much of a receiver but Schotty says he actually has soft hands, we already know what a load he is to tackle, his blocking should be better too. A couple of years under Richardson's tutelage can only help.
I can envision a scenario late in the season where they hand the ball off to him to tire out a defense kinda like Baltimore did with their FB. Just to remind you all what kind of beast Caulcrick is, let me refresh you: