They called up kuemper because he had been playing well, so he deserved it. Hackett had his turn and didn't do so well. Ultimately, Hackett was the first of the two called up, so that tells you the pecking order.
Regardless of what happens, Hackett is the better prospect to own. Even if it doesn't work out in Minnesota, he would do well elsewhere. The guy has 1A upside no matter who's farm he is on. Kuemper, to me, needs things to totally fall his way to be a starter.
League:Fantrax 20 Team Dynasty, H2H (4C, 8W, 6D, 1G)
Cats:H+B,FOW, A, G, GWG, PPP, SHP, SOG, S, SPct, W, GAA
Bench: Jenner,Gordon,Penner, Salo - Kuemper,J.Howard