Got inspired to join and add my own opinion to the fray. Used one of your pictures with photoshop and google maps to do some figuring, and, at least IMO, there's no way its a giga. Here's why I've come up with this:
I think the train leaves the station following the red line going left and down through the curve and between the rectangular footers. This should be the start of the lift. Using google maps, the distance between this point and the old KC round footers is right around 200 foot. Probably a little less. Even if you assume a really steep 45 degree lift, that just puts you at a height of 200 foot. Just beyond on this line about 50-75 foot away is Adventure Express, making it impractical to continue the lift any further. I believe most of the B&M inverts are closer to a 35 degree angle which puts the lift height increase of 140 foot. Add in the starting distance off the ground and you are probably looking into a height no higher than 150-160 foot. That fits more into the typical invert range.
Granted, my guess at the lift direction could be wrong, but given everything we've seen so far, I think we are in for an invert.