First of all, some of the PD's share primary and tactical TG's depending on the time of day.
For instance, Kent and Des Moines used to be on the same TG. Now, I don't listen to the cops too much, so I'm not sure how it's handled. In any case, if there was something going on in Kent and there were other Valleycom agencies involved, they would simply switch to the appropriate TG.
However, if the KCSO was also involved, you would see the primary or tactical TG patched to one of the south PSOPS TG's--like PSOPS-S1 or S2.
There are a whole bunch of tactial and interop talkgroups that Valleycom can use if the need.
In you situation, they may have command on one TG and using another--like a SRT tactical channel--for operations.
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