King Cobra closed end of 2000, Delirium opened 2003- two full seasons in-between with empty space. Bat closed sometime in 1982, Vortex opened 1987- a bit more than four full seasons.
Wrong...King Cobra's last season was 2001.
Bat did not close in 1982. It ran from '81 until '84, and was removed before the start of the 1985 season (though it was closed most days while it ran). Vortex did indeed come 3 years later, in 1987. As for Delirium replacing King Cobra, that came a lot quicker, as King Cobra was actually still standing when the 2002 season started (not 100% sure, 90%, and it was not not shown on the park map that year) and was torn down during the 2002 season. Probably confused people who didn't know KI or visit it before. ("Mommy, why isn't that big green rollercoaster that's half buit on the map?" "It's probably what's new for 2003, honey..."
Always tear rides down DURING THE OFFSEASON.
actually, The Bat did not operate in 1984, it just sat dormant while management figured out what to do with it. (havent we heard that again?) then it was announced that november it would be removed. It wasnt even all the way removed until 1986 so they could get The Vortex in its place...