SQL & PL/SQL :: Remote Grant Through Insert Statement Into Sys Table?

I want to grant a privilege through an insert statement into a sys table.Why do not grant the privilege through the classic way : grant select on t to l_user; ?

Because I want to do it remotely.I am connected to db1.I want to grant select on t2 to u2_b from u2_a.I assume that all DDL are DML. So a grant is equivalent "somewhere" to an insert.I tried to do my requirement locally, and here is the output.

SQL> conn scott/aa
Connecté.
SQL> -- step 1 : try to grant "normally" a select on dept to hr from scott
SQL> grant select on dept to hr;

Autorisation de privilèges (GRANT) acceptée.

SQL>
SQL> conn sys/a as sysdba
Connecté.
SQL> -- step 2 : Then, we connect to sys to see the row inserted in dba_tab_privs
SQL>
SQL> col GRANTEE format A10
SQL> col OWNER format A10

[code]...

Then if I can do it locally, I can do it remotely through a db link.