In a Political Arena of Nigeria, Cabals are the loyalists of President Muhammad Buhari, They decide the fate of individual and individuals, who are seeking for help or favour of Mr President. In Oxford dictionary, Cabal means: A usually secret exclusive organization of individuals gathered for a political purpose.

Abba Kyari was on 22 August 2015, appointed Chief of Staff to President Muhammadu Buhari.
He was an influential figure within the Buhari administration. During the administration’s first term, he worked mainly behind the scenes to implement the president’s agenda. In 2019 with Buhari’s re-election for a second term, he ordered his cabinet to channel all requests through Kyari’s office. Further enhancing his influence within government circles, and being labelled as the (de facto) head of government. Kyari appeared to be the most powerful Chief of Staff Nigeria ever had.
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It's not cabal. A man at 75 who has held top positions at the UN and should be sitting at home sipping juice and enjoying retirement should not be doing the hectic administrative role of CoS.
The man set needs a private secretary.
They should enjoy their choice.

One of the reasons why Abba Kyari seems to be "powerful" is because there was no Principal Private Secretary (PPS). The President has a luxury of appointing both CoS & PPS.
Chief Olusegun Obasanjo has both during his administration. Ex-President Umaru Musa Yar'Adua appointed only a PPS. Also, GEJ appointed both in his administration.
There's a sort of shared power between the PPS & the CoS, that's why one cannot be influential than the other, without the consent of their employer - Mr President.