Please view in a fixed-width font such as Courier.
+---------+ +---------+ +---------+
| | | | | |
| | | | | |
| 1 | | 2 | | 3 |
| | | | | |
+-------+-+ +----+----+ +----+----+
| | |
| | |
| | |
--+----+-------------+---------+----------+------
| |
| |
| |
| |
+----+----+ +--+------+
| | | |
| 4 | | 5 |
| | | |
| | | |
+---------+ +---------+
As per my understanding this is the connectivity. If RSTP is enabled in all the switches; its expexceted for 1 box to act as root.
Now, what are you trying to achive with disabling RSTP?