Specifically referring to the Rui Shi in Dashat, which can "join a Zuyong Invincibles Fireteam" combined with a number of wildcards such as Bounty Hunters which "can be a part of any fireteam in the army". My understanding is that such a link would require at least one Zuyong, but I'm not an expert on fireteam rules!
This is a VERY frequently asked question. A wildcard takes the place of any member of the fireteam fully. If you slot in a Bounty Hunter, for all intents and purposes that ABH now counts as a Zuyong for that fireteam. Note that you can't "bridge" two fireteams. You can't stick a Rui Shi, ABH and a Ghulam in the same Fireteam because the Rui Shi can't form one with the Ghulam even if they individually can with the ABH.
I have a specific fireteam I'm wondering about. Can Lupe Balboa kick Massacre out of his Jaguars team? Could she form the haris, or just the core, since after taking his place nobody actually has Fireteam:Haris?
Just for clarification I should point out Joe and Cordy both have Duo so that's a slightly different situation. Lupe could not replace Mr Deadpool in the Haris, because then no-one has the Haris skill and it's not a legal Fireteam. Lupe could replace him in a Core though
Could you take a haris with Deadpool, Lupe, and a Daktaris with no Jags? Or do you need at least one Jag for it to be a legal fireteam?
For the Fireteam Haris to be valid one member must have the Haris skill, so while massacre cannot be thrown out, he can form a Haris with his Haris version lupe and a dactaris.