[Zu Ra]

Firstly you dont need a spoiler tag for Anime only for Manga

Well Ichigo was his own reason for his injuries in a way .

Well Shiniagmis do have a habit of sealing their wounds temporarily with Leatsu to avoid fatigue due to bleeding in a battle .

Eventhough Bya did not cut him in the finale after the battle Ichias well as Bya relaxed momentarily and stopped cocncetrating their leatsu on the cuts and wounds . You did observe blood gushing out suddenly after the battle , that was the after effect

Also as Bya puts Ichi's Banaki leatsu was shattering his bones and body interanlly .Or Better say Ichi had not mastered his Banaki to endure tremdous Leatsu genrated during Banakai. SO Ichi's wounds were more severe