By your definition a migrant needs to cross borders and successfully settle on the other site. What do you call the people being forced back or stuck in holding facilities and internation camps then?
I'm talking exclusively about this particular breach. 48000 out of 50000 have returned voluntarily. I don't think that counts as trying, so talking about success is a category error. This was a (deadly) flash mob.
I assumed their qualifier was being applied to this case as well. However I don't think there's any ambiguity about who are we talking about in this specific thread of comments.