My analysis starts with the implementation of the Elliptical-Weighted-Average (EWA) algorithm within the PyResample open source Python implementation (with some Cython modules for speed)
MS2GT is based upon an algorithm developed by Green & Heckbert, IEEE, June 1986 "Creating Raster Omnimax Images from Multiple Perspective Views Using the Elliptical Weighted Average Filter". https://ieeexplore.ieee.org/document/4056910
None of this provides much clarity in defining the image characteristics and performance of the algorithm.