There are many people who witnessed Enryu’s battle against the Administrator and survived to tell the tale, and none of them mentioned that Enryu used the Thorn to kill the Administrator. Even RT himself had never seen the Thorn before and knows nothing about it.
why would the OG give Baam an enormous, fully complete, powerful weapon right from the start?
If that is the case, then why doesn’t the OG get rid of Zahard and all those obstacles, take Baam straight to the top of the Tower, and end the story?
Do you really think the OG will pave an easy path for Baam, laid out with roses?
From the very beginning, Baam has been under the OG’s test, and he must climb the Tower on his own and overcome obstacles. Enryu even threw the Thorn on the Floor of Death instead of handing it directly to Baam.