Hi Dirk,
You got it right. All the pages we redirected were pointing to similar pages once, so probably they should be okay as u said.
Regarding disavow; what are the metrics to decide on a link? Some links might be good looking with decent DA and might be hurting us. What's the best way to findout actual back-links dropping us down. Disavow comes with risk as there are chances we may reject good links, so it's better to make sure about the links.
Thanks,
Satish