No, no, no. You understand it in a wrong way.
In case of daily farming the bosses, it looks a little bit different than spoilers shows. Spoilers explain how to do it only first time to complete the quest and have access to the final boss. Once you kill all 3 outer bosses (Rupture, Realityquake and Anomaly) you get an access to 2 inner bosses (Outburst and Eradicator) that are located in the same room as the final boss - The World Devourer.
In case of daily farming you need to choose one of these portals:
Entering Zao portal gives you ability to kill 4 bosses (Rupture, Anomaly and two inner bosses Outburst and Eradicator).
Entering Svargrond portal also gives you ability to kill 4 bosses (Realityquake, Anomaly and two inner bosses Outburst and Eradicator).
Finally entering Ankrahmun portal you can kill only 3 bosses (Anomaly and two inner bosses Outburst and Eradicator).
So to have best profit possible you ALWAYS kill inner bosses - Outburst and Eradicator!
It is also nicely explained on Tibia.Fandom.com (https://tibia.fandom.com/wiki/Heart_of_Destruction_Quest)
- Zao: Enter the vortex and find your way to Rupture. After killing it and arriving at the teleport hub, enter the teleport north-west, and then go out west again. You will be at the Anomaly boss area and should proceed to kill it. When you exit you should appear in the teleport hub room as before. Go to the north-west teleport and then pull the lever in the room to face Outburst. When back at the teleport hub room, jump into the north-east teleport face Eradicator.
- Svargrond: Enter the vortex and find your way to Realityquake. After killing it and arriving at the teleport hub, enter the teleport north-west, and then go out west again. You will be at the Anomaly boss area and should proceed to kill it. When you exit you should appear in the teleport hub room as before. Go to the north-west teleport and then pull the lever in the room to face Outburst. When back at the teleport hub room, jump into the north-east teleport face Eradicator.
- Ankrahmun: Enter the vortex and find your way to teleport hub, it's a small path shown to the right. Enter the teleport north-west, and then go out west again. You will be at the Anomaly boss area and should proceed to kill it. When you exit you should appear in the teleport hub room as before. Go to the north-west teleport and then pull the lever in the room to face Outburst. When back at the teleport hub room, jump into the north-east teleport face Eradicator.