The report states that there is a total of around 100.000 fighters, fragmented into as many as 1,000 bands, which are battling the Syrian Army and you are still putting the FSA numbers between 50,000-80,000?. Those numbers btw are according to the FSA's leadership. If there are 100,000 fighters, fragmented into 1,000 bands, and half of them being jihadists, fundamentalists, islamist etc. then every single fighter in the other "moderate" group would have to be a member of the FSA, just so we would get to the cca 50,000 number. Just to think that, we would have to be very optimistic, if not naïve. If there would be 50,000-80,000 FSA in Syria then they would definetly be top dog among the groups fighting the Syrian Army and that clearly isn't the case on the field. I mean, the 10,000 jihadists force is killing their commanders and controlling the north of the country. What does the "80,000 strong" FSA control then? 
 *"The stark assessment, to be published later this week, accords with the view of Western diplomats estimate that less than one third of the opposition forces are "palatable" to Britain, while American envoys put the figure even lower." - FSA is "palatable" to Britain and the US, so I guess you need to look the FSA strength in that max one third or even less. 15,000-30,000 would be far more realistic, considering what is happening on the field of battle. The hardest fighting of the Syrian army is against jihadists and fundamentalists.