Why do they need one face? Why does any company need a single man to represent them? Why can't they just be a company of individuals that work together to make that company great?
In my opinion they don't need one because they have said network of dedicated individuals. TNA has always been a team effort from day one and if it hadn't have been it would have folded. Guys like AJ, Daniels and Joe have been the backbone for a very long time. Abyss, Eric Young and Beer Money have all been there working hard to try and improve the company. Jeff Jarrett worked his ass off to make his company the best it could be. The contributions of veterans with nowhere else to go have helped, whether it be name power or helping make the young guys better. Kevin Nash, Sting, Mick Foley, Scott Steiner, Booker T, Team 3D, Raven, Rhino, Jerry Lynn.
The guys that have come and gone in the X-Division have tried their best to provide TNA with something that is different from other companies, and while it has had its ups and downs for the most part that's happened thanks to guys like Kaz, Jay Lethal, Chris Sabin, Alex Shelley and departed guys like Low Ki, Petey Williams, Sonjay Dutt, Austin Aries, Matt Bentley and others.
The Knockouts have done their fair share of carrying the load as well. All mainstream wrestling had was divas after a brief flurry from the likes of Trish and Lita in the WWE. Then TNA built an entire division that made people care about womens wrestling and that was thanks to Gail Kim, Awesome Kong, ODB, The Beautiful People, Roxxi, Taylor Wilde, Sarita, Raisha Saeed/Alissa Flash and now Tara and Hamada.
Then of course are the guys that have departed from the WWE (quit or were released) and chosen TNA as their new home. Jeff Hardy, Christian and Kurt Angle have all helped people notice the "other" wrestling company. I know some people perceive ex-WWE guys as being rejects, but because of how contracts work we can't have people jumping ship like in the Monday Night Wars anymore, but you don't think Christian or Angle would have done so if they were allowed? You think WWE wanted Christian and Angle to leave? No. They added star power to TNA and became legitimate main event wrestlers. In the case of Hardy and Christian they were given their first world titles in TNA and the chance to be a top player in a wrestling company and they have both since moved back to WWE and become main eventers there too (though Jeff came back). TNA let Christian be Christian without any restrictions and look how much he evolved as a wrestler. Though he left again, his contributions to helping TNA grow can't be ignored and you can bet that he is silently very proud of what they've achieved.
Kurt Angle has been 250% committed to TNA since he arrived. He's been willing and eager to work with anyone and everyone, play any role they give him, work any match. He's mixed it up with the X-Division guys, the veterans, the Originals, the mid-card, everyone. He's been their star and their star-maker. He is at times the Shawn Michaels of TNA, working feuds that don't need the title to get over and trying to make a name out of a lesser-known wrestler, and at times he is the Triple H, winning titles left right and center as a heel or a face. Ex-WWE or not, his heart and soul are in TNA and he has given his entire body to trying to make the company better. He is without question one of the biggest contributors, and even if he eventually calls it a day and takes a short term contract with the WWE to work a Wrestlemania or two, it doesn't take away from how dedicated he has been to TNA.
Matt Morgan, The Pope, Mr. Anderson and countless others have shone brighter in TNA than they were allowed to in the WWE as well. So much so that people will begin to forget they were WWE guys and instead identify them as TNA guys.
Ex-ROH guys have gotten their mainstream break thanks to TNA and because their movesets are brand new to that mainstream audience, they have been a huge part of carrying TNA. Joe, Aries, Shelley, Jimmy Rave, Homicide, and now Desmond Wolfe. Even the Young Bucks/Generation ME are now wowing mainstream fans. TNA has been proudly giving indie wrestlers big breaks since day one, and a lot of those guys have gone on to become mainstays of the company.
Then finally Hogan and Flair, the new arrivals. Yes, they will forever be known as former WWF and WCW names. But they are without a shadow of a doubt two of the biggest legends there will ever be and they are in TNA now and by their own word at least, they want to make it bigger and better. They want their wrestlers to become stars.
All in all, I think TNA doesn't have one single face. They have an entire company of wrestlers that are carrying as much as the load as they each can in order to hold the company up and bring it to new heights year after year after year. The contributions from top to bottom have all been big helps into establishing TNA as the number two company, not just by default, but in reality. When TNA was born it wasn't even on the WWE radar. Fast forward to now and they are their direct competition in the same time slot and with some huge names. But TNA has its own unique identity and that identity has been a group effort.