Thread:KamiGuru/@comment-25771248-20150326113541/@comment-25771248-20150401083553

Ok, Transportation Nullifying Seal Man (Wow... Lol) Let me answer that In this way:

(1) Sage Modes differ, depending on their speciality. Eg. Frog Sage Mode requires great chakra reserves and is taijutsu-orientated (focuses more on tai... A perfect example: Frog Kata) snake Sage mode requires a strong body, a reason why Orochimaru could not perform it and Kabuto had some "modifications". It is also ninjutsu orientated. In this mode (fanon) the requirements are chakra control, something extremely difficult to master. Senkai has also done so.

(2) S-Rank doesn't mean powerful. Ranks don't measure power, but the difficulty to learn it. Eg, Rasenshuriken is not as helpful as the C-rank summoning: Food Cart Destroyer. (One can dodge a r-shuriken easier than being flattened by a ginormous Toad)

A perfect example is the FTG. It is S-rank and doesn't tax much chakra, but very difficult to master (as seen with the Hokage guard Platoon). Minato can do it multiple times without much signs of fatigue or such. Plus, FTG has no drawbacks. Same applies with those techniques, they are hard to master, but easy to use once done so. And the use with chakra exertion is equivalent to derived techniques of FTG. They are easy to perform as the technique itself has already been mastered.

The Encasement: Human Bomb takes a very small amount of natural-energy imbued chakra because they only trigger the explosions and they continue exploding using the target's OWN chakra. Hard to learn, but easy to use when done so.

Encasement: Calamity exerts natural energy in a barrier-like form, more than the previous Encasement Technique. This is the reason Senkai's sage mode faded away and he entered Iyasu's body for protection (and to relax a little). Iyasu can use the technique by emmitting a larger ratio of senjutsu chakra, but Senkai's is more focused at one point, thus increasing power whilst using less chakra. The technique merely manipulated nature itself—which already has natural energy—to attack the target, using them as a beacon for disaster.

A Hurricane coming from ALL angles into one point, plus an explosion coupled with lightning from the sky (Think Kirin... As in - Susanoo go bye-bye) and an internal explosion will, like, totally Incapacitate (if not kill) him. Even with some healing, I doubt he is immune to KOs. Senkai thought so to, so he presumed he is that way.