MS Obito and Kabuto VS Itachi, Nagato, and Konan.

[USSJ Future Trunks]

obito > itachi. he has a countermeasure for KA because danzo possessed it yet obito was never even worried about it.
we know when hes worried because he crapped his pants at danzo's suicide destruction seal and at konans explosive paper. but no concern about KA.
itachis KA is not like danzo's. first he has to get the crow out, then choose who he wants to use it on, THEN activate it. danzo can just lift up the bandage and bam, your done

 

[BenjerminGaye]

obito > itachi. he has a countermeasure for KA because danzo possessed it yet obito was never even worried about it.
we know when hes worried because he crapped his pants at danzo's suicide destruction seal and at konans explosive paper. but no concern about KA.
itachis KA is not like danzo's. first he has to get the crow out, then choose who he wants to use it on, THEN activate it. danzo can just lift up the bandage and bam, your done

Actually danzo doesn't have to do anything but activate it.

It still doesn't change the fact that danzo took it from shisui when he was using it without much of a problem.

Besides itachi's ka is pre programmed.