About he susanno, it can change forms according to the databook since it holds no true physical form..
... Jinton is an attack that's avoidable since it operates in a linear range...
Don't compare what onoki did to what mu can do.. we have never seen him do something like that , and lets not forget Tsunade was giving him chakra to make something that big...
Mu also hasn't shown the ability to use jinton while Invisible... He seems to have to come out of invisibility to attack... Not only that but even when invis, most anbu ninja, or hunter nin, or any ninja trained in using their senses such as Kakashi , hiruzen etc, can all smell or listen for Mu..Kakashi has a smell akin to nin dogs.. who were able to track ninjas miles and miles away... Itachi on multiple occasions was able to spot ninjas and people who he didn't have his eye on...etc..
Mu is strong but as I said, his attacks aren't big enough or wide enough to get anyone easily.. it's avoidable by any ninja with decent enough speed...
2nd mizukage obviously had no problem with it and he doesn't seem like a speed demon
