Jack, like Hal Lindsey have made blunders, and then a few years later, remade themselves.
If you ever go to used book stores, hunt for some old copies of thier books, and get them, and then compare what was said then to now. Different. Hals books you can still get, and some books stores get the old ones. Jack were not circulated nearly as much, and never "updateed" so its hard to do with his.
Oh, I like to hear what they have to say, and like to hear thier slant on things sometimes. However I take it all with a grain of salt. Been there, done that with them.
Bob