It is not known exactly what the agreements were with the Kremlin, but the fact is that by changing sides, Grozny essentially gained independence, and in addition, Moscow began to pay tribute to this feudally functioning formation. Ahmat was assassinated in 2004, after which his son Ramzan came to power.
In essence, a situation developed where he could do whatever he wanted with impunity. The trips of the Kadyrovites to other regions ended with threats, beatings, and executions of journalists and even judges. Russian power authorities were powerless because the Kremlin needed Kadyrov to control the region.
The ruler of Chechnya was one of the few who could afford practically anything he could think of. This made him careless and unreasonably confident, which led to defeats in Ukraine. The Chechens are a force to be reckoned with, but in Ukraine it turned out that clashing with soldiers is something different than beating up some opposition politicians.
What will happen after Kadyrov?
So, it doesn't matter if he's dying or already dead. In any case, this region of the Caucasus will soon find itself in turbulence, because the frictions between ethnic groups have not disappeared anywhere. If Kadyrov is alive, but his ability to control his group is reduced, changes will inevitably begin as well.