By otg ex katto in the corner, do you mean 236c? If so, then you can just get a hard knockdown with 2c (timing may be a bit iffy if it is otg). From there, you can just go into nero summon, mixup, etc.
Since you can use ex katto to get a hard knockdown, I wouldn't use it as a reset. Likewise, catching them with 2b when they air tech probably only works if they neutral tech or tech towards you. If they air tech away from you, I don't think 2b will be able to catch them.