You didn't understand my point accurately.
Where is the proof that Queen left Chopper alone? Why would he? Do you remember what happened on Skypeia?
And if not Sanji is most likely not fighting off two calamities, you should consider be less confident about that, not even Chrono is confident about that, ask yourself a couple of queries that wise.
There's no firm evidence he already returned to assist King, if not, assuming he did, Sanji is drawing nearer and will probably just take on one of the two, presumably Queen due plot coherence.