Sternritters still win.
I like how manimal ignores the fact that the sternritter would also have prep to counter some techniques here. You would now have people like Gremmy, Lille and Gerard putting in more work. Any high DC attacks automatically become useless via multiple sternrittters here and Yhwach now decides to use yamamoto’s bankai from the get go. Sterns with prep>>ootsutsuki with prep, just as sterns without prep>>ootsutsuki without prep. Nothing much has changed. The difference in hax is still too much to be overcome by prep, especially considering how the sterns also get their own prep.
And on that note, Gremmy, Lille and Yhwach could solo with Uryū and haschwalth providing backup. The fodder sternritter die as distractions.