i think people who think kakashi would die before obito are idiot
kakashi is the main character here,he can't die before obito
obito can't die before he changes his thoughts
if pepole think obito in other dimension is much stronger than kakashi ,i will say no
because simply
so strong fire...............go underground
small wood ................kakashi avoid that by sharingan,speed,gates,raiki to cut it
rinngan...................obito didn't show any rinngan's techs except for ninjindu which isn't dangerous to kakashi
raiki...................it isn't useless like people think ,raiki to cut obito's neck is still useful (i hope that won't happen )
but of course i don't see them fight to this limits ,i think obito would change his thoughts