Wehner's specialty is M&A but he never had an accounting background (he has a #$%$ in Chemistry). He was only brought into Zynga in 2010 to help raise capital through the IPO, go on roadshows, promote the business, and now that is over, he is no longer needed. I am sure with him at FB, one of his targets will be Zynga. A bit of a conflict of interest though if he still owns shares of Zynga.
As far as Vranesh goes, he is at least a CPA and better equipped to handle the day-to-day role of a CFO, reporting, and deal with the auditors, post IPO.
I think their executive restructuring is now complete, with the exception of HR. HR of course is last. Let's see what happens in that area next.
i think CFO's role become less relevent post IPO . good for zynga, one less high cost executive = better eps .
overall the restructuring looks very focused and in line with there vision of # 1one mobile , social, mid core and real money gaming. In the first two category they are already # 1, mid core and real money they have a good chance by next year.
on FB buyout , i doubt it will ever happen , zynga is a founder lead company they never sell out .