oh my god, youre being stupid.
let me spell this out for you.
if you spotdodge at the wrong time, you are getting hit with a jab.
if you get hit with the jab, the grab is guaranteed.
when you get grabbed, you are going to get back throw, dash attacked offstage.
when you are OFFSTAGE, Ikes aether will MAUL your recovery, because if you are using up your jumps WITH NO GROUND BENEATH YOU, you cant get past ikes aether. you cant air dodge past it because ddd is too slow in the air and you cant typically space a bair to beat it, since YOU ARE OFFSTAGE TRYING TO RECOVER, and ike has control over the spacing at that point.
once you get hit by aether, you get spiked far below the stage to the point where up b is your only option to get back, which sets ike up to either hit you with bair from the ledge, up air from the ledge, or jumping on stage to punish with up smash or something equally powerful.
this entire sequence can happen anywhere between 30 and like 100 percent.
that is why aether is good against ddd, because he can use it in positions that cant be countered by the ddd, and puts him in a horrible position.