So, if the gandabba learns Dhamma via the mana indriya from a person of similar gati that is on the Path, is it possible for that gandabba to change their next birth situation? For example, you mentioned in a post that bats changed their next birth by listening to Nobles recite Dhamma in a cave.
Seems like a gandabba or any being could do the same? Especially, the ones that just keep hanging around.