He had a throwing lane. He had enough space for my freshman in HS to make a throw to the fair side of the bag, haha. It was a bad throw (which I know no one is disputing). The only difference seems to be where he ran and how that impacts the fielder? If he would have ran in the box and then stepped in the exact same spot he would have been fine it seems. It also says if in the umpire's judgment he interferes with the fielder taking the throw at first base. So the umpire ruled that his lane interfered with the fielding of the throw, not the thrower. It seems that is where people disagree. He would have ended up in the exact same spot even if he would have ran in the lane and interfered in the exact same way according to the moment contact was made. Regardless, interesting occurrence in such a big game.
Umpiring is such a difficult job.