@lolmaolol
You didnt understand the power of information huh??? He was called E-rank Hunter long time ago due his inability to take combat, everytime he did that, he always injured badly and he was considered as the weakest of all E-rank Hunter even those who joined recently still stronger than him.
Now he become S-rank Hunter but his info was classified by a guild in order to prevent his information being leaked.
By using that, he can do whatever he want as long as his identity as S-rank Hunter didnt leaked except those examinator and guild leaders who know that already.
Just try to think, if you are a S-rank Hunter and you're wide known by others, you will have limited freedom due other guilds keeping eye on you and you cant do whatever you want like exploring low-level dungeon, taking down the boss on A-rank below and looting as much as you want.
Remember, information is the main weapon in here!