Adam3000
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Doran has a huge plan, he is playing the GoT to win. Quentyn was one part, leaving it out makes Doran's plan less than and skews his characterization.
Who poisoned the locusts is a big mystery in ADWD, leaving out a suspect on the show lessens the drama.
Yes, anyone can release the dragons, but now the show runners have to make something up. What they make up could be less than effective then what is in the books.
Quentyn's whole story arc was a great device to explain various sellsword companies and how they operate. The sellsword aspect of the book was rich and interesting, without him on the show I doubt the show can achieve this richness.
--Doran's plan may or may not even exist in the show. Two seperate canons
--The poisoned locusts may or may not even exist in the show. Two seperate canons. And even if they do, nobody has Quentyn on their suspect list anyway. Might as well say Barristan is a suspect while you are at it.
--Whatever reason there is to release the dragons is not a big deal for the show to change. The Quentyn shyt wasn't exactly mind-blowing writing. It was kind of stupid and unbelievable to be quite honest.
--None of that sellsword talk is gonna happen whether Quentyn was in the show or not. The show does not have time for that type of exposition. That is what the "History and Lore of Westeros" is for on the Blu-Rays. There are far more important missing pieces of lore to be worried about that the formation of sellsword companies
Quentyn is gone from the show. Without Aegon, Quentyn serves no purpose. His book purpose was not to release the dragons, that could have happened easliy some other way. His book purpose is likely to cause Dorne to align with Aegon and reject Daenerys. With only 2 seasons left after this there is no time for expendable side stories.
Sorry Quentyn, sorry Victarion, sorry Aegon Blackfyre, sorry Arienne, sorry Lady Stoneheart, sorry Wyman Manderly, sorry Marwyn.
All these characters have big roles to play in the book canon. But not the show canon.