Comparing Ingram, Richardson, and Lacy as of now I would say Green bay has the best of the 3. (Hope it's allright to throw Ingram in to the mix)
Don't know if Eddie will get the touches he did last year, but with a healthy Rodgers all year,and with the O-line all playing together another year, his YPA should increase.
The one big advantage Lacy has over Richardson is playing in a stable environment.
Lacy has said it himself, it took awhile for the game to slow down for him, and with a year under his belt, he can now just react and not think and worry about making mistakes.
Richardson may show all his talent this year, being he is basically like Lacy and going into his 2nd year with The Colts.