"Is it a trade-off?"
The monster was using the lion's head, but it also had the abilities of other heads. Himmel Soan suspected the lion's head's ability was to make trade-offs.
When the monster switched to the lion's head, it could use the power of all eight heads.
However, it wasn't as fast as using the bird's head alone or as impregnable as the elephant's head.
The lion's head could do everything, but none of the abilities were at its best. Because of that, the monster became even harder to defeat.
Himmel Soan's advantage was his balanced abilities.
He was good at everything and could counteract any type of attack.
When the enemy was fast, he could defeat it with his impenetrable defense. When the enemy had good defensive ability, he could defeat it with fierce attacks.
As he was a jack of all trades, he was able to get himself out of all kinds of danger.
