Except, that is not true. Aside from its mere existence (which was only proved by a singe line of Riveria mentioning there were only 2 Level 7s in the world) we know nothing about where is the other Level 7. The one you are talking about is the Knight of Knights.
Its true though lol. He is in the beach doing something, That's what I mean "ON THE SEA"
Finn stated that on the game. Of course I'm talking about the Knights of Knights. I'm not talking about Zald and Alfia here because Ottar was still level 6 at that time. I'm talking about the present. I know that the other level 7 is the Knights of Knights no need to tell me.
If anything, the KoK being in the sea would imply that they are part of Poseidon Familia since they were said to go in a rip to clean the sea.
Poseidon isn't even introduced nor stated yet. Plus what? go in a rip to clean the sea? who said that? no one lol
Ok, let's take away the sea part and just say the Level 7 is containing a monster. Why? If the Level 7 is powrful enough to make it retreat and survive then it should be strong enough to kill .If they are really not enough then just call someone to hlp them and get over with it. What you are proposing is that they are wasting their time.
You can't take away the sea part because it won't make sense. If he did kill those monsters, he would be back to Orario by now. Then why is he not back yet? Because those creatures live in the sea and if he goes back now then he would leave those monsters to attack other people.
"If they are really not enough then just call someone to hlp them and get over with it."
Who would he call? Ottar? Hell no.
Maybe because if they lose all of Orario and its citizens will be destroyed? If Finn went as far as to ask help in person to the Goddess of their rival Familia means he is disposed to do anything it takes to ensure their victory. Not caling their "hidden ace" like you call it would be stupid.
Then let him leave the beach and let those monsters freely roam the surface and kill citizens as well? That's stupid. Yeah Finn is desperate, but not as desperate as you think it is. If he were to call that guy it probably should be where they are in an ALL out war. Also the Knossos incident affects the Freya familia as well, Finn knows this and even Freya, so Finn knows that they would accept his offer. They won't drink wine while Finn and the Loki familia is fighting for the city's safety.