With manga knowledge, Neji has no idea about Akamaru having to mark the opponent with urine, and what purpose it holds. Neither is this something the Byakugan can pick up on, since it isn't chakra related. I can post numerous scans of Neji allowing an opponent to get near him. So without intel, this will never be an issue. Rather just Hyuga supporters who are always under the delusion that these characters can foresee and counter everything, because they're magically deemed untouchable, despite the manga blatantly disagreeing.
It being a requirement that Kiba needs to first restrain the target in order to execute Dynamic Marking was never specifically stated by Kiba in the manga or in the databook. What was shown in the manga was Sakon/Ukon conveniently charging at Kiba, and initiating the contact themselves. Not Kiba himself going out of his way to restrain them as some sort of requirement to land Dynamic Marking. Neji being a CQC fighter, and showing no skill with Air Palm yet, has no choice but to allow Kiba and Akamaru engage him in close quarters; as he canonically did in his fight with Naruto and Hinata.
So I would love to know how Neji successfully counters Dynamic Marking, when A) He has no intel on it, B) Byakugan will not pick up on it before it's discharged, due to urinating not being chakra related, and C) I being so obviously unpredictable, that it will confuse the enemy, per databook.
Databook II said:
Dynamic Marking (ダイナミックマーキング, Dainamikku Mākingu)
Taijutsu, No rank, Supplementary, Short to mid-range (0-10m)
User: Akamaru
A smell mark where an sight mark can't help*
Sprayed around with a stirring spin!
Good manners? What good manners? Disregard everything to make the greatest use of dogs' sense of smell!! By boldly "urinating" from the air and spinning with all ones might, the spray is scattered across a vast range!! Being hit by just one drop marks he end. One can neither run, nor hide. The ninja-dog's fangs will continue to be aimed at them.
[picture of Akamaru spinning in the air, performing Dynamic Marking]
↓→Akamaru's violent rain of piss will confuse the enemy and at the same time, it will greatly humiliate them.
[Akamaru using Dynamic Marking to mark Sakon and Ukon]
As stated, a single drop will suffice. Thus, Neji's only line of defense would be to use Kaiten to completely knock all of it away. Being completely caught off guard by this tactic, he will not have the ample room of time to complete Kaiten. When Naruto Bunshin feinted Neji, he barely had enough time to get off Kaiten [
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]. This was against Naruto, who was canonically inferior in speed to CE Kiba, let alone SRA Kiba. Neji gets marked.
