You are bringing up and incredibly important point: Yes, surrender is power. But not the power of the ego. In truth, the ego is powerless. The universe is all power there is. Has anyone witnessed the tremendous power of the mighty ocean? Or the power of the 3 X 10^26 Watts of radiant energy from the Sun? Of course we have, countless beings have. How does the power of the ocean arise? The ocean surrenders to its own power. Being itself, “surrender” is really just “Being”.
So if we go back to our true nature, just Being, then surrender is the same as being our true Nature. The issue of power and surrendering to the power is the perspective of the ego. Which after all, does not exist. This is the mystery!