To Quinn's surprise, the others were happy to allow him to have the emperor tier crystals. They did ask for a few things in return, king tier crystals and funds to go towards fields they were interested in around the ship. Still, they didn't mind Quinn getting the crystals they obtained together.
They knew what they were facing, the enemies that might come after them, and weren't arrogant enough to think that they could succeed without Quinn. The stronger and better he got, the better it was for them.
At the moment, the Cursed family couldn't compete with the other factions just based on sheer size. They had more members, and if a full scale battle was to happen, they were likely to lose. Even if Quinn and the other leaders lived, what was the point?
There would no longer be a faction to run and what was the point of them creating one in the first place, if not to protect the people in it. What they could do was minimise that risk by making Quinn just as strong as the leaders.