One of the most recent comments from that group was:
Debate away![ x ] = Controlled by Blockstream
[ x ] /r/bitcoin
[ x ] Manufacture and distribution of hat propaganda
[ x ] github commit access for bitcoin repo
[ x ] Arbitrary consensus metrics for Segwit, e.g. 95% is good but if we only get 30% we are being attacked
[ ] Non-trivial hashpower
[ ? ] bitcoin itself
I don't think anyone does now or will ever fully control bitcoin, but iterations and competing implementations are the only way full control is prevented. I think it's difficult to argue that bitcoin today is 100% currently uncontrolled.
Bitcoin today has an anti-fragile control structure. You get control as long as there is a realized benefit to your control, like monarchs in the English Civil War. If you mis-manage your control, even limited control, you lose it.
And like those monarchs, propaganda is a key part of keeping control. Controllers have mis-aligned incentives in that they need continuity to continue implementing their "best" agenda, so must perform their own Proof Of Work and constantly demonstrate worthiness.
I think the current system in bitcoin is like this, and is about to fragment into multiple competing implementations —> better approximation of uncontrolled.