I) Counter; Samehada
You may have misinterpreted the purpose of Samehada; it is not a partner, but a tool. Disarming Kisame from his sword makes no difference - nearly all the techniques he has done so far can be executed even without Samehada.
- Can absorb Chakra through skin contact from any object he grasps on, as long as it has Chakra channeled through it [
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].
- Can perform his largest jutsu's, which require large amounts of water and also has Chakra absorption advantage.
- Has strength not only rival, but exceed that of Gai (stronger physically than Kakashi) [
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]. Note that this was only merely less than even a third of his power. Real Kisame is about more than 3x stronger [
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].
Not to mention, this is only a small time delay. If Kakashi attempts to steal it, Samehada rejects Kakashi firstly due to less Chakra (so it would not betray him), and second of all due to not being it's master [
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]. Kisame can easily use his telekinesis or symbiosis abilities to summon it forth (by levitating) [
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].
II) Counter; Suiton
Bare to keep up with me as I'm telling this. By calculations, Kisame has more than 300 times larger Chakra reserves than Kakashi. Yes, this is true. Neji stated clearly after facing him the first time - Kisame has that level of Chakra like Pseudo-Tail Naruto. Base Naruto has been stated to have 4 times more than Kakashi Chakra. After gaining a bit of Kurama's Chakra, it is hundredfold (100 times) larger than Kakashi's. While Kisame was not even in his full strength at that time (stated to be 30%), he would naturally be 3x stronger than at that time when he met Team Gai. By simple calculation, he has 300 times more Chakra than Early Shippuden Kakashi. Even if Kakashi had 5 or 6 times more Chakra than before, such pathetic attempt would not even hinder Kisame's level - telling how monstrous he is in terms of Chakra. Therefore, there would be no point in mimicking Kisame's Suiton techniques due to;
a) Not having same Chakra level. Kakashi has no way to combat his level of Chakra.
b) He would tire himself out, leaving himself an easy target for Kakashi.
c) Not be able to do as big scale, therefore not even blocking his attack but wasting his Chakra as well. His attack would be flushed away, while Kisame prepares a new one.
III) Counter; Fusion
First of all, that's not what he would do. Firstly, he doesn't have a Chidori Nagashi. That means the electricity would come out of his hands and harm also him. Also, Kisame is a sensor. He can sense the build-up of Chakra before the technique is executed. He would leave Kakashi there paralyzed and get him after the electricity has done it's job. Third of all, Kisame has previously absorbed electricity from Kirābī. Such thing is not only doubtable, but can be easily countered.