The accumulation of labor power through central management of the capital stock isn’t something you’re going to understand or accept as a single sentence.
You want this to be like the Bible, where you can just quote John 3:16 and nod sagely, as though it should be revealed wisdom.
But the material is more complex than a bronze age scripture verse.
That said, capital accommodation is one stage of economic development. This is the chapter which covers the process of economic development. At some point, you do need a handful of central administrators to oversee productive use of capital. And these administrators will become rich as a result.
Marxism doesn’t refute this process, it leverages the process towards Socialist accumulation.