L1b recapture - success rates of approval

I’m currently on L1. My initial L1 individual petition was approved in March’2009, but i first came to US in Aug’2009 and been here since then. In march 2012 my L1 Extn got approved for 2 years.

Now my current L1 petition will expire on March'14 and my employer is now filing L1 extension to recapture 6 months that I have spent outside USA. I have few questions,it would be great if you or anyone in this forum can answer these questions -

a. Can my employer file green card on L1B (individual) visa? Will I be able to stay once my GC process is started?

b. What is the success rate of L1 individual recapture?