More workers in the area are now working outside it in areas with a lower minimum wage.
Any given change means nothing, a pattern of such changes is important.
(And note that your real minimum wage is little above ours and your training wage is below our minimum wage.)
You are searching for meaning in data that it insufficient to carry any meaning - and so you are projecting upon the data conclusions that you wish to see, but which cannot possibly be present.
The level of minimum wage in jurisdictions other than Seattle and its surrounds are of no relevance to this discussion whatsoever, so I am not sure why my noting something that is irrelevant is important to you; But by the way, we don't have a training wage. We have junior rates - they apply to people below the age of 21, on a sliding scale based only on age. Training has nothing to do with it. And our real minimum wage is
very significantly above yours - US$13.62 at current market exchange rates, or US$11.84 using the June 2016 OECD PPP comparison figure - That's US$4.59 per hour (PPP), or
58% more than the current US federal MW rate of $7.25. But perhaps you don't grasp just how significant a small number of additional dollars per hour is to a minimum wage worker - Do you think that a minimum wage earner would say that a 58% increase in their income would provide them with 'a little above' their previous income? Our federal MW for ALL workers over 21 years of age (regardless of any training they do or do not have) is still
7.6% more than the Seattle MW rate of US$11, even when the calculation is done using the PPP adjusted figure. Would you consider a 7.6% pay rise to be 'little'? I wouldn't.