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Supposing Nagarguna had established a religion with a teaching going further than the Buddha's preaching... Dear Nirmal

If that was the case then the Buddha would not be "a Buddha" because a Buddha is by nature fully enlightened & instructs the Dhamma perfectly & completely.

What is true is confirmed via realisation. The Prajnaparamita Sutra instructs the sphere of nothingness, which is a temporary state.

It follows, in mistaking nothingness or 'no-thing' for emptiness (sunnata), the Prajnaparamita Sutra is an inaccurate expression of emptiness.

The Prajnaparamita Sutra is actually a step backwards because, before the Buddha gained enlightenment, he, as the Bodhisatta, rejected the sphere of nothingness as Nibbana.

The teachings of the Mahayana are largely devoid of proper understanding of vipassana & dispassion (viraga).

In Mahayana, vipassana is considered to be analytical reasoning, which is far from the reality of vipassana.

Also, the teachings of the Mahayana are also largely devoid of proper understanding of dependent origination and reduce dependent origination to a mundane teaching of inter-relatedness rather than a diagnostic explanation of the origin of suffering.

Best wishes