Re: Your own personal continuity
The Tzenkethi mentioned in DS9 are the same race as the Kzinti in TAS (a variant spelling). 'Xindi' is also another variant spelling. Meaning the references to a 'Kzinti' war 100 years before TOS are quite able to fit into canon
It's a FAAAAKKKEEE!
Senator Vreenak- In the Pale Moonlight