...not so srue about him being on even footing with his big bro as a half-demon. Sesshomaru could have killed him quite a few times if he had wished it. He's just way too fast so Inu's big attacks won't even come into play before he is defeated.
Remember, he's much faster and stronger and tougher as a full demon yet Sesshomaru wa sstill just dancing around his slashes.
And for those saying he didn't master his demon form, that's kinda at odds about what I read. I made a topic about him being a really powerful berserker in demon form and someone corrected me. They said his demon form just became a powerup as he no longer lost his mind when he changed. That sems to be supported by the incident with Kagome in that demons' stomach.