Yea , but neji can't be as fast as weightless Lee as Lee has been working his ass off around the clock to attain such speeds tho a case can be argued that with neji's prodigious aptitude like sasuke and cqc dominant fighting style his speed should be >=weighted Lee >>>>forest of death sasuke as his data book stats and small speed feats in the CE suggest.
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Neji has no problem predicting the sand with his byakugan and or stopping the sand from grabbing his limbs or sangwedgin him , using his ability to release or blast chakra from all his points.
The only issue is if neji's jyuken chakra can affect the chakra channeled in gaara's gourd sand which makes it harder , faster etc. Could neji add a large amount of chakra into his strike and destabilize the sands chakra making it softer and passable kinda like this?
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Which would surprise gaara and given neji a clean hit.
Sand tsunami is a move used by SRA Gaara and with the aid of added sand he harvested from the ground.