Not quite true, lesser known developers have been successful on Kickstarter in the past. An example off the top of my head is the game "No Time To Explain" from relatively unknown developer tinyBuild[1]. The key here seems to be producing a cool looking prototype to show off to Kickstarter, then gathering funds to polish the game, add content and finish development.

It seems like Kickstarter is more than capable of helping unknown developers generate funds to support development.

[1]: http://www.kickstarter.com/projects/1296948465/no-time-to-ex...