Yup. Page 13, the running figure with the big hat looks very fmailiar - I want to say it's from the fight on the road between Manji and the three Itto-ryu dudes (one of whom has the Spider Jerusalem glasses), but I'd have to look it up. Page 17 bottom left, the close-up on his face also looks familiar, but I'd have to search for it. Page 19 last panel, too. Page 20 has three panels - the first one I think is taken from a panel where Manji begins fighting Shira on the road when he's traveling with Magatsu, the second one ... maybe the same scene, but I'm not sure (that hand on his kimono looks really familiar), and then the third with the sandals is either from that scene while they're walking or back again to right before the fight with the Spider Jerusalem dude and his friends.

All of them I'd have to look up and double-check, of course - he may have changed some of them enough to be fine and it's just me looking for similarities that are making them really pop out. (And I find it pretty telling about how much of a BoI fangirl that I am that I can ID individual panels. XD)

I really would like to see this artist with another writer and without the source images so obvious - change the hair, change the props, change the post a bit.