You got it pretty wrong there. You may have noticed that there have been a Bitcoin Gold fork following BCH . They are now mini groups which are more or less fully centralised. There could have also have been a segwit2X hardfork but the community kept together despite their varying differences of opinion. We can conclude that BTC has a larger and more inner chaos within its community thus proving that it is more decentralised.
People's delusionalism to live on false hope of a 100% decentralised system is worrysome. Power and money and greed always corrupts. To date, we have been unable to fulfill the main purpose of the creation of a digital currency like BTC.
Well, only time will tell. All I need is 6 months to prove you are wrong.