And now we enter the realm of probabilities. To be quite frank, that first segment of your post boils down to "But it didn't effect everything!"
It effected enough. Understand where the goal posts are before your move them.
'Style' isn't a cladistic word, where 'style' remains constant through all descendants - it's a descriptive word, it describes the work - taking influence from someone who came before doesn't make you the same style.
That's we often have monkiers or Late, Middle and Early (Insert style here). But it's still (insert style here). You're creating a false dichotomy. Stop it. It's annoyoing. Almost as annoying as the abandonment of your primary examples and the continuence of the minor points when the examples were countered.
But heck, I'm not even sure Manga exists at all as anything and am severly tempted to go back to calling it all sequential art when in serious discussion about it.
In other words, I no longer think there is a Manga style.