“FlashForward” showrunner Marc Guggenheim departed ABC’s sci-fi drama for good Tuesday, sources tell AICN exclusively.Reasons for the departure remain muddy. Ratings for the sci-fi drama have slid in adults 18-49 from a 4.1 (at its premiere) to a 3.1 for its fourth installment, but ABC just gave the show a “back-nine” order that will keep it on the air long enough to hit the April 29 six-months-hence “flash forward date” central to the series’ mythos.Evidence suggests network executives were unhappy with the quality of the show's post-pilot storytelling.Guggenheim, the “Eli Stone” creator whose resume includes stints on “Jack & Bobby,” ...

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