I don't remember either of those things happening so could you just post scans so I can determine the specific reason they were detected? Most likely Kabuto heard their footsteps or sensed their chakra. Muu suppresses his chakra and he flies so neither of these would be a problem.
Rustling noises in the bushes = sound. Muu doesn't have to make a sound to attack.
Thanks for at least linking scans.
-Kakashi detected the Iwa nin because he heard his footstep. Read the bottom right panel where there's the "tap" sound.
You must be registered for see links
. Matter of fact, this scan just shows how hard it is for Muu to be detected. Kakashi's skill at feeling the presence of air currents wasn't good enough to detect the Iwa nin, and that was in a situation when he was on maximum alert. Raikage on the other hand would completely let his guard down.
-Orochimaru wasn't trying to sneak up on her or even attempting to hide his presence. On the other hand Anko was actively seeking out Orochimaru and knew he was somewhere in the forest. Not the same sort of situation. Either she heard him emerging from the tree or sensed his chakra.
-Itachi could have heard the leaves rustling when Naruto's clones emerged from the bushes, plus it seems he had already spotted them out with his sharingan. Notice where his eyes are looking in the middle right panel.
You must be registered for see links
There is a HUGE difference between sensing the presence of someone when you're aware an opponent is near, and sensing the presence of someone when you have no clue that there's actually an opponent on the battlefield, and no examples anyone has brought addresses this. Sage Mode Jiraiya, Ma, and Pa were
You must be registered for see links
despite all three of them being sensors, even though Ma has canonically sensed Pain [
You must be registered for see links
]. Even Onoki who had his guard up knowing Muu was lurking somewhere didn't realize Muu was right onto him until Gaara warned him [
You must be registered for see links
].
Then there's the fact that Muu pretty much negates any ordinary means of detection with his jutsu.
-One can't hear him since he can noiselessly glides through the air.
-One can't see him because he's invisible.
-He probably can't be smelled, considering an Iwa jonin was capable of
You must be registered for see links
and Muu was hyped for his ability to hide his presence. Not definitive proof, but take that into consideration at least.
-His chakra can't be sensed because he hides his chakra. You already know that even non sensors can sense chakra, and so-called "sensors" are just people who refine that ability to the maximum. One of the primary methods of seeking out ninjas is by feeling their chakra, and if the chakra source is large enough, or near enough to the person seeking them out, they can be detected. Muu bypasses this method of detection entirely.
Onoki had intel on Muu's fission but that didn't help him. Onoki's a lot smarter than Ay...and going behind a stone pillar and splitting means Ay doesn't see him do it.
