To me this is a hint about how much more Comcast is willing to bid..... to reassure Wall Street that an increased bid will not be too much debt. If they can get rid of the RSN's, then they can increase their bid at the value of those RSN's and (in their mind) be at the same place they are now. It's an effort to keep their stock price from dropping into the mid to high 20's.
Of the 22 RSN's, there is a reasonable argument Comcast could keep 8 of them which have no overlap to their current holdings. Do you sell them off 1 at a time, in small clusters, or in one big bundle. Personally, I like the idea of an IPO with the funds going to reduce debt over time.
With 5G investments coming (next gen of wireless), they (Comcast) are going to need capital to invest in the future of their network. I believe Comcast will be selling more than just the RSN's, and at the end of all of this, Disney will be in a better place to get their Marvel IP (controlled by Comcast) under their roof.