According to the manga "Bleach", which this whole forum is based on. It is technically impossible for shinigami to use garganta, unless somehow creating an artificial one with months preparation which ONLY urahara could do because of his studies, and i guess Stark could be compared to urahara but that's it. Even if they use it, in the manga it was a one way ticket and when the captains used it, it indeed did stay open, but Aizen closed it by his own will, trapping them inside.
Whether you agree or disagree provide your arguments below
Whether you agree or disagree provide your arguments below