However, Renji doesn't do anything significant for the remainder of the arc beyond carrying Ichigo to the final battle and that is something that is not going to happen in Bleach TYBW Part 3.

Unique, underdeveloped characters in Bleach manga get more screentime in TYBW anime to showcase abilities and personalities. New scenes for characters like Kyoraku, Shinji, Renji, Yhwach ...