First of all, he's got a sword, which improves his reach and ability to inflict damage. Second, he's got a crap-ton of reiatsu (which he will need against Yusuke) and the ability to use Bankai and activate his Hollow powers. Essentially, it would start out evenly, but Ichigo would gradually gain the upperhand as he changed forms, before finally finishing it with Getsuga Tenshou. Unfortunately, the Spirit Detective's Spirit Gun falls a little short against the the Shinigami's Zanpakuto.
That's all for that.
So far, the battles have been:
- Hanma Yujiro vs. Furinji Hayato (w)
- Makunouchi Ippo (w) vs. Takeda Ikki
- Master Roshi (w) vs. The Third Hokage
- Ryu vs. Hanma Baki (w)
- Kurosaki Ichigo (w) vs. Urameshi Yusuke
That's all for now. Until next time, good luck and train hard!