It was included as a possible alternative but not studied. If it was then getting this whole thing back on track would be as simple as saying they want to use the alternative now then it could be signed off on in short order since it would have state support.
TransCanada assumed they could buy off the locals/state to make a cheaper routing work. When that failed industry pressed a Congress hungry for issues to feed to the presidential race to insert it into the payroll tax legislation.
sigh. Please actually read the report. You don't have to read the entire thing just the executive summary (short version) and if you had you would know that you are again wrong.
They did the exact same study on the alternate routs in order to base their very well defined and specific reason as to why they thought the original route was best.
This is an official environmental impact study, what do you think they said "yeah, we uh, we are pretty sure the original route is much better than the other proposed alternatives so that is what we are going to recommend"? The science is there in the long version on everything they recommend as far as I can tell but their reasoning behind suggesting the original route was very specific with impact studies done on all of them and weighed against each other.