(Raiton: Raikiri) - Lightning Release: Lightning Blade
Perform the technique: Yusei performing the needed hand seals Ox → Rabbit → Monkey concentrates his lightning chakra and condenses it even further then he would a normal chidori, with the effect being a more concentrated condensed chidori that is much stronger in power.
Creative uses/strengths: A more advanced and focused version of chidori.Strong enough to actually split lightning.As you stated this is very versatile because its not just a 1 hit KO like most of the time we see it in the anime.It can be combined with taijutsu to deadly affect.
Drawbacks/counters: Just like a normal chidori it remains in the users hand. Making it very limited in range so the user has to get close to the opponent.Not only that but something as simple as an earth tremor could stop the attack because most uses of raikiri require some type of movement to pull off.
(Raiton: Raikiri Nibai Raikou Jishin) – Lightning Release: Lightning Blade Double Lightning Quake
Perform the technique: Yusei focuses Chakra in his right hand and vibrates the chakra changing it to that of Raiton chakra. After condensing the chakra in his hand,Yusei forms a raikiri which he then splits into 2 holding a raikiri in each hand I believe A rank
Creative uses/strengths: As you said its situation.It can do everything the normal raikir can.However I find this more versatile because it effectively turns both your hands into weapon and makes it harder to counter tai compared to the single version because the user could coordinate attack to you weak side being the side that you dont have the jutsu active.Something else to not is that you have 2 attacks able to counter 2 techs 1 tech on this side and 1 on the other.
Drawbacks/counters: An obvious drawback is the power is split between the 2 hands.In doing so the the technique not only loses power compared to a one hand strike but it also restrict the user.It restrict use of what would be their free hand if using the single version who with could use a sword as you mentioned or even throw shuriken or a paperbomb.
(Raiton: Kirin) - Lightning Release: Kirin
Perform the technique: His sensei having already set up the clouds , Yusei created a chidori which he used to take control of all the lightning in the clouds and direct it downwards at the opponent in the blink of an eye.
Creative uses/strengths: I have been wanting to learn this forever.Well in terms of strength its the strongest it can only be avoided (if completely preformed) by space time techniques or absolute defenses like sussano. However the reason behind its strength is more so about its speed rather then overall power.Being Natural lightning chakra doesn't slow it down as it strikes in the blink of an eye. Making it so that if fully preformed only something that can bend space and time like kumai can dodge it and although sussano can block it Im curious if the user has to have it active beforehand im doubting if sussano can be formed in the blink of an eye.
Drawbacks/counters: Obvious drawbacks are that you essentially need 3 moves to pull this off One being a fire jutsu to heat up the sky and fill it with storm clouds (although this doesn't need to be done in the same move) Move 2 being forming a chidori and move 3 being using the chidori to take control of the lightning in the storm clouds.(which take 2 urns of the allowed 2 per turn)Another drawback is as you said the opponent tricking the user and preforming karing using the clouds set up for themselves.(Also I see alot of people discuss Since the user has to preform chidori first they have time to prefrom a technique is this valid?)
Oh and dont worry im branks actually one post away from A-ranks