So you think this is a contest of control over future developments of bitcoin? Interesting. I would assume both BTC and B2X remain open source projects, where everybody can join in and contribute technically. Control over a currency isn't privy to the dev team, within Bitcoin there are 5 different groups who all extert specific extent of control. The development team is just one of those...
My .02
Great video!
he who controls the github repository controls the applications downloaded from it
Any Github repo can be cloned and forked. Open source projects are rarely defined by long term control by a single individual, I think you are overestimating what control Bitcoin core actually has.
Also, did you read the last statement of Coinbase: