@COBRAMORPH: I think you are severely underestimating the training and skills that Black Canary and Huntress have. First of all, Black Canary IS one of the best fighters in the DCU, through her own work and training with Wildcat. Ted Grant is a master of more than just boxing (the list you can read here on his page here at comicvine), is also a pilot during WWII and for the JSA. Black Canary has held her own or defeated some very dangerous martial artists in the world, this list including Lady Shiva who she traded places with so, while Shiva served on the Birds, Dinah went through Shiva's training.
Huntress is also an exceptional combatant. She has a great level of natural tenacity in a fight, something that gained Shiva's respect when Helena stepped in for Dinah to fight her during the last pre-New 52 BoP volume, as well as natural skill for combat. While not the most skilled fighter, what Helena brings to the table has kept her not only alive, but let her overcome better fighters than her, although Dinah still outstrips her by a fairly large margin.
You rank Barbara as the highest? The first time that Helena and Barbara met when the ladder was still Batgirl, Huntress beat her in three pages beat her easily. Here is a link so you can see the fight itself: http://www.comicvine.com/forums/battles/7/batgirl-babs-vs-huntress/26023/?page=3 Barbara was never that good of a fighter, even though Batman trained her some, she just didn't take to it and the jobbing Nightwing did to her during her New 52 book was just Simone trying to make Barbara better than she is. Her best skills always lay with her mind, but never H2H.
The training that Zinda has from serving in the military is WWII is based on quick and effective techniques designed to take a foe down quickly yes, but there is something that you have to remember: Dinah, Helena, nor Babs use the "sport" versions of their martial arts. They know the true deal and they also use was works from what they know. Zinda can take a blow, she and throw a mean punch, but against her two fellows in Dinah and Helena, she falls decidedly short of being able to beat them and against Dinah would be lucky to land a hit.