Ok asuma blows mist away but zabuza can create more and If asuma continues to blow it away he'll lose his chakra because mist barely takes chakra to create. Also zabuza could fake asuma out with water clones then water prison like he did with kakashi and kakashi>asuma. And his giant vortex water jutsu is elementally overpowered to asumas fire
do you have ANY idea how MANY hand seals does Giant Vortex need? 18 that's A LOT, on the other hand, Asuma's Dust Cloud Technique is FREAKING SUPER FAST and requires just 3 hand seals, he could do this technique 6 times and Zabuza would do only 1 + there is no guarantee there is water source nearby O__O
maybe, but if Kakashi could counter Zabuza in Hidden Mist, why shouldn't Asuma who was even guardian of Fire Lord? personally think that yes, Kakashi is stronger than Asuma, but Asuma is better in short-range combat AND has more experience, as Zabuza prefers short range, i think it's obvious that Asuma could beat Zabuza
if zabuza`s mist would be so easily blown away,then surely someone would have done it when zabuza was reanimated...but it was a hell of a trouble....like 50 guys couldnt handle the fog and kakashi had to eliminate zabuza to stop the mist..i just dont think asuma would have handled it by himself...kakashi barely did it with his sharingan and his sense of smell and he had to get blood on zabuza`s blade to do so in part 1...
you do understand Wind Nature is SUUUUUUPER rare? we have seen only a couple of people to actually use it AND let's not forget, that Zabuza never fought anyone who has Wind nature, Naruto doesn't count as he didn't know he had it xd + Temari herself stated that she is the 2nd strongest Wind User of the Alliance (think she didn't count Tsuchikage, but still xd) so i doubt that there are some high skilled Wind users in alliance