Im sorry but Superman may be a launch type ride but its definitely not similar to Kingda Ka(KK) or Top Thrill Dragster(TTD).
Superman is an out and back ride, not a complete circuit ride like Kingda Ka/ TTD.
The most boring part about superman is the tower so its sad to hear you claim that they already have one as its a sad example of a drop tower all you can see is the sky not the drop, which leaves only the launch as a strong point. Thus its known in my circle as "Super Boring Man" Like I said before the only exciting part of the ride is the launch and that high g part only lasts 2-3 seconds. when your at the top (halfway up the tower) you cant see the drop at all, you can only look to the side or hang out the side and look down. I want a big thrill and a big drop thats what im hoping for, if they have to remove superman to get it so be it, Superman wont be missed especially if its replaced a TTD KK type coaster.
Plus Knotts is the opposite direction near Disneyland and a log haul for SFMM locals. the KK,TTD ride type is definitely something missing from six-flags MM