That is more an IRC! Thanks!!
No, I was just too exicted, and logged in to the wrong server!
In the real one, id=2 was indeed missing:
mysql> select * from mdl_config where name="siteadmins";
+----+------------+-------------+
| id | name | value |
+----+------------+-------------+
| 19 | siteadmins | 108,102,116 |
+----+------------+-------------+
Ran the update command and got:
| 19 | siteadmins | 2,108,102,116 |
But this admin is still "weak". Even a logout/login didn't help. I am still investigating.