Zawahiri claims that the only AQ affiliate in Syria is Nusra. This is supposed to be a matter of funding, but ISIS certainly appears to be the better funded group. ISIS soldiers have camp-patterned knee-length shirts, Blackhawk tactical vests, Camelbaks, iPads and iPhones, fleets of Toyota Hilux technicals with AA guns, and enough chitrali caps to make them look like the Taliban. They also possess the most tanks. It is often claimed that ISIS spend less time than other formations at the front, but where did they get so many T72's with reactive armor? They really resemble a foreign army in itself, and they have most of the foreign fighters. The claim that they are not affiliated to AQ is attractive to foreign fighters who might not want to carry that stigma back to their home country if they need to go back. Nusra is mostly all Syrians who've been brought into the AQ fold. They're badass fighters, but they basically look like FSA fighters who wear Tawheed bandanas. ISIS clearly appear better organized, disciplined, and funded.
YouTube: https://www.youtube.com/embed/NemKUrgko08
Also, if anyone doesn't believe that IF is Saudi funded, why are they shooting off all of the old Saudi ant-tank missile stock at the same time the Saudi's just made the biggest purchase of US weapons in US history including a massive amount of new TOW missiles? Liwa and Jaish al Islam were clearly funded above and beyond their battlefield promise, and how? Where did their weapons gear and uniforms (US military pre-digi desert BDUs) come from? There could be another answer to this question, which I am open to as I'm still a bit perplexed how Hezbollah got some many American desert-digi and woodland MarSOC FROG suits, so maybe there is another explanation, but it would certainly appear that IF is a Saudi operation, and practically everybody involved in Syria or paying attention to it has reached the same conclusion to the point it's practically established factor.