I am not a SMN, however I think a large part of the previous egi complaints were not so much about size - but more about how poor the models looked. Just random shapes and polygons floating around with the element colour..

I don't think shrinking the current Bahamut model to something closer (maybe still a bit bigger) would cause too many complaints about it.. It's more that the egis just look pretty rubbish compared to the SCH fairy models or even Carby.