Well as austria I was getting crowned HRE pretty frequently and when I wasn't Spain was. So, I'm elected HRE again in the late 1500's and decades later I'm almost sure I'll be elected again because my monarch is getting old. Then he dies soon after and before I can celebrate something strange happens. Cologne declares independence form a massive Hessen and is elected HRE! I'm guessing they were elected because there relations with protestants were at nuettral since they just declared independence and everyother catholic nation had pretty bad relations with protestants. As a Hapsburg nation It wasn't worth it to send state gift after state gift to those unruly northern nations since I have a bonus, but Still I doubt no one else has had Cologne become HRE in their game.