L only lost to Light because because he only had theories instead of solid, concrete proof. I'm not saying his theories were wrong, quite the opposite as a matter of fact, all of L's theories ideas were right on the mark. If he didn't tell Rem to write L's name in her Death Note, and he did manage to figure out that the "13 day" rule with Light's Death Note was fake, he would've figured out that Light wrote those in to fool him and L would've won.
Dethklok Roadie #500 [Male]
Red Tie Coven Member #19 - Z-12 - Klokateer Commander and Temporary RTC Leader and Manager
Founder of The Klokateers Guild - Klokateer #1 - Supreme Commander of All Klokateers
PSN: ZTwelve - Xbox Live: DethDealer12