Even if Putin tries to capitalize on the attack of drones on the Kremlin, the larger context shows it was Shoigu's way of forcing Putin to introduce martial law.
Martial law would mean a de facto military coup, as levers of power would pass from Putin and FSB to Shoigu and the military.
Despite Putin's attempts to increase his influence in the army by 'rotating" generals, it is still loyal to Shoigu. Moreover, Shoigu has created his own PMC, which could overcome the army's combat capabilities.
One thing is required of Putin - to sign the introduction of martial law, after which he and his clan will lose influence on the situation.
The situation is similar to the start of the war. After Putin agreed to the special military operation, he lost control over the army. Even if he desperately tried to preserve the image of Russia's only and all-powerful ruler.