2K > 2D > 214H, ]K[
Eddie can be summoned on reaction to 2K > 2D connecting. Completely reversal safe, it's best to delay slightly before jumping or dashing to mix and confirm that they have blocked drills and haven't done a reversal.
Prototypes of Full Theoryboxes
There are a few common ways to setup 236K oki and many options for the mix afterwards. First we'll break down setting the oki up, then go over several of the options afterwards.
2K > 2D > 214H, ]K[
Eddie can be summoned on reaction to 2K > 2D connecting. Completely reversal safe, it's best to delay slightly before jumping or dashing to mix and confirm that they have blocked drills and haven't done a reversal.
4D/6D, 236K
This is what makes Zato's backthrow in the corner such a scary option to be hit with. Never miss an opportunity to go for this when possible.
... > 2[H] > 236S/]S[ > 214H, dash, 236K
This option is useful if you realize you want to unsummon early and are able to start the unsummon immediately after using "Leap". ]S[ has more frame advantage on the knockdown than 236S and so it's very easy to go for slightly greedier oki if Eddie was already out.
The sequences before using this setup generally involve either getting a hit with solo Zato on oki or as a punish or having used 236[K] beforehand to gain an additional Eddie action.
Be sure not to input 236K too early as you want to give time for the Eddie gauge to refill.
... > 2[H], ]K[(1), delay 214H, dash, 236K
This option is for when you don't have enough Eddie meter to use "Leap" and unsummon. Slightly tricker, it's easy to time the sequence incorrectly and fail to meaty or leave yourself open to reversals. Still a valuable route to learn as it can often be used to stop just short of breaking the wall, enabling the following mix to end in wallslump.
In most instances of corner oki where 236K or ]K[ is used as a meaty, you can opt to clap cancel into 236K to reduce the amount of Eddie meter used by the full sequence of drills. This can save enough meter to allow for an additional Eddie action in the followup sequences.
In most instances where you setup 236K oki with a hard knockdown you can opt to OTG for extra meter and damage.
This will only cover layer one of the mixups from 236K oki as there are an extremely large amount of branching options from each of these first round mixups.
jump, 66, slight delay j.[S] > j.D, ]P[, 2K
The first option, and a very strong one. This is equally effective against opponents who are aware of the mixup as it is against those who are not.
Make sure to delay the j.S a small amount after flying to ensure it both lands as close to same frame as the immediate low as possible and so that you fall slightly before it connects. Additionally, it is important to delay a while after j.D before releasing "Pierce" to ensure you get as much frame advantage as possible. If ]P[ is done too quickly any normal you try after j.D can be mashed or thrown.
jump, 66, slight delay j.[S], 2[K], ]P[
This is the most likely option to be blocked against weaker opponents as they will instinctively fuzzy guard low after a falling high. This does not make it a bad option, it is still very important to rotate this into the options you pick.
jump, 33, 2[K], ]P[
Low option for the initial high/low mixup. In additon to being a mixup in its own right when paired with j.S this option also has a variety of vary strong secondary mixups afterwards such as tick throw and 5D
jump, 33, slight delay 623S
It's important to introduce options into your mixup that punish the opponent for patient blocking if possible. Additionally, the 623S includes a "Leap" release which can help make your throw safer if they opponent jumps or backdashes. The oki after command throw is generally weaker than 236K oki, but the damage and meter gain are well worth it.
If you delay the 33 IAD you can delay the 623S less or not at all. Whichever you choose it's important to ensure the opponent has left blockstun for at least five frames so throw protection is gone.
jump, 66, j.[S], 5[P], ]P[ WS > 214H > 5H
Cowards (and smart opponents) will occasionally take the hit on purpose. This is smart as it can prevent from from getting mixed for more damage, put in a wallslump situation, or potentinally get them out if you aren't ready to convert.
There are a variety of conversion you can do. If you don't jump and instead dash up to confirm you can get slightly higher damage.
The conversion shown in the section above aren't perfectly optimal, but were routed to be similar from any of the options and be able to consistently wallbreak. The route you choose will of course vary with the wallhealth and based on the amount of Eddie meter you have, amount of tension you have, and if you chose to OTG or not. The basic tenets of Zato's combo structure do apply.
As you have at least one "Pierce" and one other Eddie action after meaty 236K you can easily run a second layer of mixups should the first fail to open your opponent up. Generally these set of options overlap with general blockstring pressure and mix but a few ideas are listed below.