I know that's not how football works. Was just fishing for a bite...
Anyway in 2005 Hibs were stuffed by Dnipro, in 2006 (the same year Derry wrecked Gretna and knocked out Gothenburg) they were beaten by Odense and a couple of years later they were shoved out of European competition 4-0 on aggregate against Elfsborg. Still sound deluded?
I don't necessarily think Derry would beat Hibs over two legs, now or then, but it's not that fanciful an idea.
And, besides, no need to speculate when there's evidence to hand - Gretna qualified for Europe representing Scotland and got tanked by and Irish side. No point mitigating it.