V4P6 ~91%:
"...and began quietly speaking the same time." -> "...and began quietly speaking at the same time."
(On re-read, I can see this being less an error and more just a style thing so ignore if you think it's an unnecessary change)
V4P7 ~82%:
"...she wasn't going save them." -> "...she wasn't going to save them."
V4P9 ~75%:
"...still hadn't been to locate Rebirth's..." -> "...still hadn't been able to locate Rebirth's..."
~85%:
"Having found a clear goal and trained diligently using his newfound sense..." -> "Having found a clear goal and trained training diligently using his newfound sense..."
(Suggestion here but "trained" doesn't sound right, I assume this isn't just me though...)