Suggested by Sonic Axel has his flaming discs which are definitely pretty handy to have. It ensures that he always has a chance in these battles. That being said, Renji still has the edge here. He’s much faster than Axel to the point where I doubt you’d even be able to track his movements. Axel would just be throwing his discs into the air for all the good it would do him. Renji won’t need his bankai here, a few simple but effective sword strikes will do the job just fine. Renji wins.