not sure it would be possible to have a book exist in 2 places in the order.
That i would say is HUGE understatement. There are books which should be presented in more than 2 places (example: read on).
I'e tried once the chronological X-men order. The main question was always: "who the F*?k are those people? anyone seems to know them". It wasn't fun, so i stoped reading chronological orders. In my opinion chronological reading would kill all the fun from such stories like (Now: Example) X-men Forever (2001 series). The whole point of that story was to find out what happened behind the scenes. That kind of story writing is the THING that made me love X-men - their whole mitology is based on flashbacks and shifting points of view (if You know what i mean, because i really don't know how to say it in proper english)
To make myself clear: I respect other people desires. If there are people longing for chronology good for them. If Travis decide to do it - that's his call (and his HUUUUUUUUUUUGE amount of WORK). I'm just saying that for me it would be the parameter totallu unused.