Cygnus Knight buff

About that free slot... How about this:

Right now I have (one account one world):
- Adventurer1 (linked to Cygnus1)
- Adventurer2 (potmule)
- Adventurer3 (Inactive, but I'm not going to delete this one)
- Cygnus1 (got the 4th slot for free when making one)

What if I would delete the Adventurer (potmule), and make another Cygnus that is linked to my other (semi-high lvled inactive) adventurer. Would I get that 4th slot for free again?

Since when I would delete the potmule, there would only be 3 characters on the account, on that world, and the linked cygnus would be the 4th one (and I have 4 chars atm).

Does anyone know if that is possible:
- Adventurer1 (linked to Cygnus1)
- Adventurer3 (linked to Cygnus2)
- Cygnus1 (linked to Adventurer1)
- Cygnus2 (linked to Adventurer3)
(deleted the potmule)

So, would I be able to create the Cygnus2 (for free) with Adventurer3 if I deleted my potmule (Adventurer2) and I had only 3 characters on that world? I don't wanna risk trying and failing, because since I'm from Europe I can't create any more accounts...