2 things I need to ask about Kimmimaro and Haku.

[Rikodou Mode]

Kimimaro was ridiculously strong. He could have been high Kage level easily

 

[Char Aznable]

The one who can trace his bloodline back to Kaguya Otosuki.

 

[Narusenpou]

haku held out on the and he had potential seeing that kakashi got the chills putting narusasu with him alone

kimmimaro wasn't the kind that thinks,he believes brute force so much

 

[Izou Xaxa]

If Kimimaro would have lived longer he would have become a very promising strong fighter

 

[Lariatoo]

Both had potential to be insanely OP on their prime. Haku freezing all the water in your body and Smashing you to pieces Sub-Zero style and Kimimaro with full bone armour and telepirtation trought bone forest