This whole 'writing for the trades' thing confuses me. Beast Wars: The Gathering and The Ascending were both collected into trades after they finished, but each miniseries was only 4 issues, so the trades only had 4 issues. Perhaps if ReGen1, with it's 20 issues, was divided into story lines/trades of 4 issues each, it would have given more scope for everything. Issue #0 wouldn't have been necessary as more time could have been given to the stories it contained.

#81 - #84 - Loose Ends Parts 1-4

#85 - #88 - Natural Selection Parts 1-4 (Yay, less time wasted here!)

#89 - #92 - Destiny Parts 1-4

#93 - #96 - ADDITIONAL STORY!!!

#97 - #100 - The War To End All Wars - Parts 1-4

But if they were that desperate to get five issues into each trade, then why not pad them out with an issue of the original run? They reprinted issues #76-#80 in the '100-page spectacular'. That's 5 issues. Why not have put one of these original issues in each of the subsequent trades? Then, IDW get to sell 5 trades instead of 4! That's good business sense.