The reason it doesn't make sense leads me to believe that Sitton played as large a role of this decision as anyone. We're not going to know the details and everything is a guess. MM and Ted will never divulge a reason they had a falling out, because they maintain professionalism and move forward. I don't expect Sitton to say anything now that he's signed with another team and moving into the season either.
anyway, as a team, I think GB can overcome the loss of Sitton just fine. I'm not convinced that Taylor was their plan, but rather a mix of Barclay, Tretter, Linsley on the line, but with Linsley being hurt, they are moving forward with what they have.