Nah, most of their fighter have been hanging back in the areas surrounding Kobane. They haven't seen any action. ISIS isn't stupid, they now know if they flood the theater of combat, all of their fighters would be vaporized. So they're sending fighters into the TOC as needed. The fighters they're sending are mostly useless though and keep getting capped along with their commanders. Two senior commanders were picked off today by snipers.
Persistent and fearless is not how I would describe them. Unbelievably stupid is a more apt description. They've lost a significant percentage of their experienced, senior battlefield command on this folly of theirs. Even if they ultimately capture Kobane it'd be a Pyrrhic victory, and a short lived one. AC-130s and B-1Bs would raze whatever's left of Kobane and all of the goatfuckers in the theater.
They should have pulled out a long time ago, just like their daddies. Even Liquidfire is questioning their strategy at this point.