Re: kakashi + stamina> all ninja ( cept madara and hashi)
You're gonna get so much flame... Prepare yourself.
Kakashi was at the beginning of the series one of the most strong characters, Kishi created Kakashi to be a genius (master of the 1000 jutsus), a character to be very famous (Sharingan Kakashi) and powerful (recognize to be at Kage level at age 29), but, Kishi decided to give him a huge handicap, Kakashi had a low stamina, so low that he could only use the sharingan for a short period of time, and could only use chidory 3/4 times.
Recognizing the huge handicap/mistake that Kishi made (everyone improve stupidly in power and stamina), Kishi re-invented Kakashi, by now he can use easily the sharingan, use the mangekyu/kamui very fast at Uchiha level (faster then Obito himself) and use chidori over then 5/6 times.
By now Kakashi became the strongest LIFE ninja alive (Naruto kyubi and s6p mode not included).
In my opinion, Kakashi could, and this is my opinion, became the strongest of all, IF, and I emphasize the "IF", he could master the Obito's Kamui Space-Time Ninjutsu. If he master that technique, with Kakashi brains became the strongest character of Naruto World, but, because this show is call NARUTO,, I think Kakashi will not master Obito technique.
In my Opinion; Kakashi + stamina + Space-Time Ninjutsu > all ninjas.