"ocularly burdened"
^ there is no proof of this whatsoever. Nor is there any proof that Kamui's speed increases overtime.
Kakashi notes that controlling the Bijuu with his eyes
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- keep in mind that he was referring to lesser beasts, not the Kyuubi, the strongest of them all. Obito agrees with Kakashi's implication.
Minato also hints this when he says "
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," implying there is some form of strain keeping it under his control. Minato states this again
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.
Scan of Kakashi's Kamui "out speeding" Obito's.
"
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"
By feats Hirashin is faster than the summoning Jutsu; all you've done is pointed that out. If it couldn't even hit a target as big as the Mazou mid-teleport - which everyone could see; then it has no chance at all of hitting Hirashin users. Your analogy is flawed.
Not really sure what you're saying here at all. Hiraishin summons the user to the knife / tagged object, whilst summoning summons the animal to the desired location of the user; the two are akin, barring the fact that FTG is "reverse summoning."
The larger the target, the more difficult it is to teleport - Kakashi has stated this multiple times. If he could tear off a building sized arm, humans will not be difficult at all in comparison.
More Impressive Suiton? In part one he required 44 handseals to do a Jutsu Tobirama could do with one. Tobirama also has Suiryuudan just like Kakashi. The only thing that is worthy of note is the Jutsu that he copied off Zabuza in part one. Even then a Suiryuudan can stave that off.
Kakashi's water dragon also absolutely dwarfed Tobirama's; there is no evidence that Kakashi would need that many handseals to perform one as small as Tobirama's (see Kabuto's). He has also used a large Suiton wall without a source and seemingly with minimal handseals considering it managed to intercept Kakuzu's fire/wind combo mid-air.
Kakashi's hand seals have improved; he used to have to weave them for Raikiri, yet in Part II we see him making double Raikiri, and Raikiri when one hand is preoccupied (ala vs. Pain), making it impossible to weave handseals.