How many of the patrons did actually vote in that poll? Normally and speaking with experience from other polls (not erotic game development), these closed polls are a "Mogelpackung"(eyewash). Only a small number of people are allowed to vote on a subject and of this small group only a minority does cast one at all. Oftentimes barely 20% of those allowed to vote in a specific poll do so. These polls are perfect to bend the numbers as you like them.20% patrons only wanted the Ian's part early. It might be different including pirates, but maybe not more than 50% imo. And Eva didn't want to release Ian's part only but was feeling pressured to do it so she made a poll. In your scenario Eva would release the update when it's ready with Ian and Eva parts without asking anyone.
If Eva, as you said, did not want to post the Ian part individually in the first place, then that is her decision as the developer. No need for these Gewissensheftpflaster (difficult to translate roughly band-aid for your conscience).