So I was reading some old chapters and realize something on what Toki (Momonosuke) said:
"Like the Moon, you are ignorant of the Dawn. If there is one ardent wish that must be fufilled, it will be when nine shadows are cast woven together through twenty years of moonlits nights. Only then shall you understand the radiance of Dawn"
I think this is the reason why Jinbei was not added in the current story yet. Because those "nine shadows" are the Strawhat Pirates.