Multiple image urls and structures

Hello,
I am preparing to change the main site of my multisite. And I am confused by the multiple urls and file structures of several images from two years ago and before.

For example one image is available on two different image url structures:
http://hornaffairs.com/tg/2015/01/23/tplf-victory-to-repeat-poverty/image-tplf-40th-anniversary-official-banner-jpg/ (on this link, it looks like a post with comment space)
http://hornaffairs.com/tg/wp-content/uploads/sites/11/2015/01/Image-TPLF-40th-anniversary-Official-banner.jpg

Again it is also found on two thumbnail urls:
http://hornaffairs.com/tg/2015/01/23/tplf-victory-to-repeat-poverty/image-tplf-40th-anniversary-official-banner_thumb-jpg/
http://hornaffairs.com/tg/wp-content/uploads/sites/11/2015/01/Image-TPLF-40th-anniversary-Official-banner_thumb.jpg

Again it is available inside the relevant article:
http://hornaffairs.com/tg/2015/01/23/tplf-victory-to-repeat-poverty/

All these are indexed by Google!

I don't know how this happened. But I am confused on how to fix it.
When I change the subsite domain path, which of these url addresses should I redirect? What should I do with the rest?

Thanks.