In the meantime Node: Flüelapass (1456730408) | OpenStreetMap was moved to a different location and received some more tags. If it’s now the actual “col”, it should probably be part of the relation for the pass road. Maybe it should have the role “saddle”.
I opened a separate discussion about the problem that search doesn’t actually find the relation for the pass road: Search for Flüelapass doesn't find pass road