How many nana stages? What is the difference between the 16 stage insight meditation vs. 10 stage insight meditation? What about 0 stages any teacher teach 0 nanas? 

What is the basis for "nanas" is the suttas?
Bhante Ñāṇadassana made a work about all/the ñāṇas as they are found in the skripts:

Wisdom and the seventy-three Kinds of mundane and supramundane Knowledge

Introduction
The `Seventy Three Kinds of Knowledge' appear as a
Summary or Table of Contents (màtikà) in the first Treatise
on Knowledge (¥àõa-kathà) of the Canonical book Pañisambhidà-magga (translated by Bhikkhu ¥àõamoëi as The
Path of Discrimination, PTS ed. 1982), and then explained
in detail.
Expounded by The Buddha in His discourses (suttas) to
audiences according to their level of progress in the path to
deliverance (and found now scattered throughout the Pàëi
Canon1
), these knowledges were, as it is traditionally accepted, compiled and grouped in their sequential order, dealt
with under special headings and amplified (in the Pañisambhidà-magga) by The Buddha's chief disciple, Venerable Sàriputta, the one declared by Him foremost amongst His disciples that possess great wisdom (mahà-pa¤¤à: A i.23), and thus second in wisdom only to Himself. (SA ii.45)...

(Not put on accesstoinsight.eu, as htlm, for now, so letters are here not proper displayed, open work, but fine in the pdf)

An approach in teaching with pictures, in accordiance with the Visudhimagga can be found here:

Teaching Dhamma by pictures: Explanation of a Siamese Traditional Buddhist Manuscript

A current ongoing discussion &quot;Suttas vs. (modern) Vipassana&quot;- Discussion can be found here:

What are khanika, Upacara and Appana Samadhi?, on D&amp;D