In a co-op or partnership structure, the workers provide capital and superintendence/control in addition to labor. That's why the workers can get all the profits. And it's also why "pure" co-ops or partnerships are generally restricted to low-capital-intensity businesses - by definition, it's going to be quite hard to raise external capital. You could do it by issuing bonds, but the risk profile is unattractive for all involved.
The only way "labour gets all the profits" is under the umbrella of communism - and even then, the state still extracts profit anyway (just under a different name - that of central allocation).