Perhaps there was a lack of faith in the project to fully fund it, or EA not wanting to throw money at a IP that they did not own, or knowing that John Riccitiello days were coming to a end, perhaps his influence faded to such a extent it became difficult to make any sort of deal with all that turmoil going on.
Could be a million reasons. Its kind of a mess, as these things usually are. With 3 companies all with their fingers in the pie, its bound to be complex. So its a lot of "he said", "she said", timeline of events all over the place etc.
At the end of the day, thank god the game got made, and the boys and girls at Respawn got paid to do their jobs and will continue to get paid. One has to remember the hell they went through with Activision, to once again face problems, layoffs and stress makes one glad not to be working in that industry.
I agree about the complexity of all this and obviously we're only seeing pieces of what happened. I am glad it was made although I won't get to play it being a PS4 owner. I hate seeing projects being canceled and the lay offs that can follow. Let's hope they can get proper time and funding for Titanfall 2 to make it bigger and better than the first.