When the Zillo Beast was brought to Coruscant, it eventually escaped and went on a rampage, primarily to seek vengeance upon Chancellor Palpatine aka Darth Sidious. Was the Zillo Beast's escape also a part of "everything that has transpired" and thus "has done so according to my (Sidious') design"?
Improperly handled, the Zillo Beast is definitely a major threat to the Sith's plans for the Jedi and the Republic: if the Zillo Beast turns out to be more than the Jedi can handle, Sidious may be forced to use his Sith powers in self-defence, thus exposing his identity. Whether he will survive such a scenario, even if he unleashes his full power, is questionable too.
If the Zillo Beast's escape is orchestrated, then Sidious must be certain the risks can be and are indeed fully mitigated - without needing to expose his identity - before proceeding. However, nobody seems to fully understand the Beast's characteristics yet to provide the information for Sidious to make a sufficiently accurate risk assessment with. From what is indeed known, I'm unconvinced that it inspires complete confidence in him that the Jedi's abilities can fully mitigate said risks.
Sidious leaves nothing to chance. He only exposes himself to apparent danger in his schemes when he is confident no harm will come to him - either because it's all orchestrated and he is in no actual danger, or because he is confident in the Jedi's ability to rescue him before said harm is successfully inflicted. As such, I feel that either I am missing something and Sidious is indeed fully confident the Zillo Beast will not pose any real threat to him at all, or its escape is indeed unanticipated and thus the threat it poses to his plans - and possibly his life - is real.
So, which is it?