There's no removing the strike, unless you can provide the proofs required for that specific month. For example, the November 1 - 7 AC requires Activity from October 1 - 31 and we will accept no other proofs apart from that.

There are players who don't mind settling for passing by hiatus or failing for the initial activity check, but change their minds later on (apping and such) and dig up their ACs for that month to change the status -- that is all right with us, as long as the proof falls under the required dates.