Anyways no. (As lain said.)
You can "heartline" the middle of the car, but were the actual riders are no.
However you could construct the track, it could never happen. The riders are off the track, there is no way you can get them to heartline.
Not fully correct. You would need all the riders to have the same heartline. You'd either have to change seat position of make sure you only allow clones of one person on the ride. Don't forget that everyone's heart is in a slightly different position within their body.
If the inline wasn't hearlined, the riders would roll above and below the track causing major lateral G's. At least hearlining the center car allows the riders to roll over giving you positive and negative G's, which we can withstand more of.
From memory I don't think it was heartlined at all, I think it is just a flat spin, but very drawn out to minamise lateral forces. You can see what I mean in theis video, especially the section taken from further back on the train.
Great ride though!
^ Heartlining the centre would work as you don't want the riders to move laterally, instead, you want to create vertical G forces, a sort of head-over-heals movement. It's exactly the same as heartlining a traditional coaster, you're eliminating lateral G forces.