I'm not sure if this is true anymore now that the end of concourse C has been walled off at DTW. By my count, there are now 105 gates at McNamara (it used to be 121). Terminal 1 at MSP has 114 gates. DTW would still have a slight lead in total gates (131 vs. 124).
Where does it say that Concourse C of DTW has been walled off?, because I have not heard of anything about that.