New beasts and improved taijutsu
Oh how Sasuke loathed me too. He was almost hostile about his anger at never forcing me to use my full power or ever winning one of our spars. Iruka sensei tried to offer us new sparring partners but I didn't care either way and Sasuke vehemently rejected the idea.
"If I am ever going to kill my brother I need to be the best and until I win against Kenzo that will never happen!" he had said firmly.
Iruka sensei was helpless at that point and could only let Sasuke futilely try and close the distance between us. See the thing about closing gaps was that you had to actually understand exactly how vast the gap was before you could say you did. Nobody in the world had a single clue what my full power was and I worked quite hard to keep it that way. By my fifth and final year at the academy I could launch solidified air with a single punch that packed so much sheer power that if it hit a normal person they would turn into bloody mist.
I know that because I used it on a normal wild boar about as big as a person and that was what happened. In a related note I had been slipping away in secret since the Uchiha massacre to train since I couldn't do so any more in the regularly used parts of the village or my house without exposing my strength. Funnily enough I had earned a bit of a reputation in the village from the way I looked and acted. I was eleven this year and had matured in a decidedly strange way by now. My body was literally as durable as steel to the point I could deflect regular sword strikes with my skin alone without getting even a scratch.-
Mimicking my new beasts finally patched up a glaring issue with my taijutsu style in the form of my legs lacking ways to contribute beyond moving or hind kicks. I gained two new moves with my cricket form in the form of a forward kick that used EVERY muscle in my legs and a blurringly fast forward tackle. Mimicking Kuma gave me the strongest but also slowest form of the style that utilized absolute force above all else but needed the longest time to prepare.-
It was a bit like compressing a spring as I primed every muscle in my body while coating my arm in chakra to lessen the strain on it. My bodies full power sent through a single limb in a single attack caused a lot of devastation but at the same time came with it's own recoil as without the chakra coating my arm I would snap it in two places severely. That was a lesson I learned the hard way and needed to somehow explain away to get the arm treated.-
Mimicking my caterpillar didn't net me any positives besides a creative new way to use chakra to attack. It was basically just punching or kinking and following the physical attack with a projected fist or foot made out of chakra like an echo, I called it chakra lag. It was nastily effective too if my opponent didn't know about it before hand as after dodging the physical attack most people relaxed their guards subconsciously since there was a time gap before I could attack again. It was small but everyone had the same problem which was what made the echo that came during that gap devastating.-
It was exactly like dodging a punch and without that person recovering or even stopping the original punch getting decked out of nowhere. I am pleased to inform that I got asked to record the technique down and it was given a rank of B much the same as chakra flow. Unlike chakra flow however it was not so simple to learn for others and apparently even the third Hokage took about five attempts to get the hang of it. The same Hokage who mastered every chakra nature and could use any jutsu that wasn't a kekkai genkai in the village , he needed to try multiple times to grasp it.