Aww, you shoulda captured jaw. As long as arm had the ability to fight at, he could land one heavy near wall then start climbing and you both could've gotten over (during annie ambush arc).
btw stealing a shifter as a captain (or getting to captain after stealing one) gives you the shifter rank im pretty sure, like first week of the update i saw some dude with the rank and he said thats how he got it, also saw some in best of fw/media