Most of the current speculation focuses on Altice and Charter, and the potential involvement of Sprint or possibly TMO. But there are many other permutations also being discussed: Comcast could afford to buy any of the other MNOs in the US, but it has seen the risk of holding large amounts of debt when it acquired AT&T Broadband to double its size in 2001, and once again after it acquired NBC-Universal in 2013 for a total of $23bn in two transactions. In both cases there it knew what it was buying, in this case it will know far less. Speculation about Dish and Sprint has been rumbling for years, even after Dish lost the battle to acquire Sprint, to Softbank.…