People underestimate Washington. Unlike virtually all the others, he had almost no cards in his hands.
This was a seat-of-your-pants operation. The war started with almost no organization - that includes the obvious, as well as training or materiel. Washington had basically nothing to work with.
Add to that he wanted to temper himself and the whole movement so nothing might turn into a nightmare like the highly overrated French Revolution would be, the proletariat simply mobbing the the nobility system.
Washington basically tried to confer with Congress and defer to them, never wanting to overstep. While begging for help in money, provisions, and training.
Once Washington had had enough seeing the Cabal, he took greater initiative on his own without worrying so much about Congress.
He managed all this brilliantly. And ultimately, he got what he wanted - defeat of the King without total breakdown and chaos and counter-tyranny at home.
Excellent summary and comment.