again, more than questionable, considering we were in he middle of the biggest legion invasion ever, and the LK remained quiet. no leader would see why they should focus on the LK (whos doing nothing as far as they know) when the legion is currently fcking shit up.
all of that are big ifs. as far as we know, the jailer just had to hope sargeras fails. he was bound in the maw, and casualties clearly werent high enough for him to break out OR be on sargeras level (otherwise BfA wouldnt exist)