The forest gives Kidomaru a huge advantage here. Kidomaru's web is supposed to be able to have enough strength to trap two elephants, but I think that Sakura actually has more strength than that via chakra control. You can say that he never said a limit, but the fact that he said a specific number implies to me that he couldn't handle 3 or more. However, that's only one of the problems Sakura has to face here.
Kidomaru is extremely intelligent, just reread the Neji vs. Kidomaru fight and that will become obvious. He should be able to catch on that Sakura has incredible strength and medical ninjutsu. Thus concluding that it's best to just stay at a distance from her and barrage her with 1 hit kill attacks. Since he's in the forest, he can just hide from Sakura's viewpoint and I personally don't think she has the intelligence to get her out of this predicament. Her best chance is to grab hold of the nearest tree and swing it around to destroy his hiding places. This seems pretty reckless though, and it leaves her open to multiple surprise attacks if need be.
Thread logic = Kidomaru wins, and here I agree. Sleeping bombs and poisoned kunai aren't likely to play a part here.