This is the story I heard from a couple of sources and does make sense.
But I hold no responsibility if this turns out to be rubbish :)
Apparently Arrow were lined up to build 2 coasters for the new park, El Diablo and a 2nd bigger one at the back of the park, plans were drawn up and construction was started on El Diablo with it being in the middle of the park and other attractions and areas needed to be built round it, with the major coaster at the back being less of a priority due to its easily accessible site.
When construction was part way through on El Diablo the park management had a rethink on the back of the park and having seen B&Ms coasters decided to change it to having one of those (Dragon Khan) in the space that was origionally to be taken up by the Arrow coaster.
Arrow took issue to this as it would obviously mean their major ride in the park would no longer happen and they would miss out on a huge profit to be had. As part of their protest they stopped building El Diablo leaving a partially finished ride in the centre of the park.
Park management prompted took issues up with them legally and Arrow was ordered to complete El Diablo as a fully operating coaster, but the full origional designs were not to be followed, hence what should of been an extra third to the ride became a corner and a brake run between 2 lift hills.
Take from that you what you will but that appears to be the proceedings.