User blog comment:Junaid-Sennin/Chinjao Family and their True Objective/@comment-5962458-20130509085245/@comment-3097081-20130509110816

First: Everything that happened on Punk Hazard was televised to the entire criminal underworld, remember. It doesn't seem unreasonable that Kaido was also watching.

Second: entering the tournament is just an excuse for them to be in Dressrosa without arousing suspicion. When they get the chance, like if they get close to Doflamingo, they'll attack. Also, since the prize is the Mera Mera no Mi, if they win they can get a power-up to help them take out Doflamingo.

Third: age and generation doesn't have anything to do with being subordinates. Kaido is a Yonko, and remember, Law said the only way to survive in the New World is to either become a Yonko's subordinate or to take them out. So it's not unreasonable to imagine that Chinjao might be Kaido's subordinate. Also, we don't know enough about Kaido, he might also be an old-timer.

Finally, I'd just like to again say that this blog is just a theory, I also think that I could be wrong.