Question about R.mika's "reset"

So im still fairly new to SFV and fgc terminology, and i've been playing mika and utilizing her corner "reset". Now i say "reset" because i don't know if thats the correct terminology. Anyway, i was wondering if the irish whip into corner bounce into Cr Hp into grab (cant remember name) was a guaranteed thing. What i mean is will i always get the grab? I've had people upper cut me out of it , or jump out of it , and im wondering if thats because of execution error, or the grab can be avoided.