Mahādaśā lord in its own Bhukti

 Traditional principle that the Mahādaśā lord may not fully deliver the promised results during its own Antardaśā (Bhukti). The reason is not that the planet becomes incapable of giving results, but that its results are distributed across the Mahādaśā and its various Bhuktis.

A useful way to understand it is:  Mahādaśā lord in its own Bhukti

When a planet is both Mahādaśā lord and Antardaśā lord, it is operating at the same time as:

• the overall controller of the period — Mahādaśā lord
• the immediate agent producing events — Bhukti lord

Because the same planet occupies both roles, its results can be intense but not necessarily complete.

The complete manifestation of its significations may require the participation of other Bhukti lords through:

1. Association with the Mahādaśā lord
2. Aspect on it
3. Dispositor relationship
4. Ownership of relevant houses
5. Placement in a particular bhava
6. Yogas involving the Mahādaśā lord

Thus, if Jupiter is Mahādaśā lord, for example, its own Jupiter Bhukti can strongly activate Jupiter's significations, but the final or fuller manifestation of those matters may occur in the Bhukti of another planet connected with Jupiter.

The important distinction

It would therefore be better not to state: “The Mahādaśā lord does not give its full results in its own Bhukti.”

Rather: “The Mahādaśā lord's own Bhukti strongly activates its promise, but the complete fruition of that promise may require the Bhuktis of planets connected with it.”

This fits the broader Parāśari principle that a planet expresses itself through several channels simultaneously—its house ownership, placement, associations, aspects, and dispositor. Consequently, the results promised by a Mahādaśā lord are often unfolded progressively through its Antardaśās, rather than being exhausted in its own Bhukti.

It does not mean that the Mahādaśā lord gives no results in its own Bhukti. Rather, the Dasha Nātha requires another Antardaśā lord to activate and manifest the fuller range of results promised by the Mahādaśā lord.

The mechanism can be understood as follows

Mahādaśā lord = the main source of the period's promise.

During its own Bhukti, the same planet is both the Dasha Nātha and Bhukti Nātha. Therefore, its results are certainly experienced, but the expression may be more confined to:

• the bhava occupied by the planet
• the bhavas owned by it
• the bhavas its aspects
• planets associated with it
• its dispositor and dispositor relationships
• the yogas in which it participates.

But when another planet becomes the Antardaśā lord, that planet provides a different channel through which the Mahādaśā lord can express its promise.

So, we can formulate the principle:

The Mahādaśā lord establishes the field of results; the Antardaśā lord provides the channel through which those results become manifest.

This is why the own Bhukti of the Dasha Nātha should not be interpreted as “no results” or even necessarily “incomplete results.” It is better understood as direct expression of the planet itself, whereas another Antardaśā lord can bring out different dimensions of the Mahādaśā lord's promise through the relationship between the two planets.

For example, if the Mahādaśā lord occupies the 10th and aspects the 4th, its own Bhukti can certainly produce 10th/4th-house matters. But if the next Antardaśā lord is strongly connected with the 10th lord, 4th lord, or the Mahādaśā lord, that particular Antardaśā can become the channel for a more specific manifestation of the Mahādaśā promise.

This fits very well with your earlier point: A planet has many modes of expression — ownership, placement, association, aspect and dispositor.

The Antardaśā determines which of those potential expressions gets activated more specifically at that time.