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.
... > 2H > 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, using ]P[ as your first Eddie action to combo a mixup, or having used 236[K] beforehand to gain an additional Eddie action.
... > 2H, ]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.