No he had a 3. Says who? You? The manga showed that a 3 in genjutsu is enough to break an A ranked genjutsu casted by a user with a 4.5 in genjutsu.
They're not considerable, but they're higher than Zabuzas. Zabuza is different because he has horrible genjutsu. Just because people are sof similar rank doesnt mean they are capable of the same thing. Hell Naruto beat a chuunin before he even became a genin. Mizuki isnt capable of half the stuff Naruto's class did. If jonin were capable of the same thing, then Zabuza wouldnt have to do 40 handsigns just to do a b ranked water jutsu. Nothing is elite about him.
Temple of Nirvana is an aoe genjutsu. Zabuza is getting caught.
No. He died to fodder with spears. An elite jonin would have solod them. I dont even think the guys who killed Zabuza were even ninja. Just fodder grunts.
Not really. That point in the manga was covered by the 1st databook where he had a 2.5, you're bringing up later stats.
The manga made pretty clear Zabuza is a high level shinobi. Denying what was established doesn't make your claims true. If nothing is elite about him you might want to explain why Kishi made him a Jonin, one of the 7 Swordsmen, why Kakashi was in a bed for a whole week after fighting him, why Kabuto revived him together with KKG users even though he doesn't have one, etc...
Do you know how genjutsu works? Kabuto can't manipulate Zabuza's chakra flow if he doesn't know where he is. The mist was used against Kakashi specifically to counter this, and he was much more dangerous because of his Sharingan.
He was armless, wounded and tired of fighting Kakashi. Still had enough strenght to pass through dozens of men, killed many of them with a single kunai in his mouth, until he achieved his goal and decapitated the leader, then got impaled multiple times in the back and was still alive.
You're in denial and/or have selective memory if you think those fodders defeated a Jonin in a fair fight and there's nothing impressive about Zabuza.