Is Intelligence Built Up from Basic Skills?

Which virtual assistant will ultimately win the race?   Will it be a matter of having third party vendors building the best  'intelligent skills'  to make them most useful?  Amazon Alexa claims some 10K +skills, though most are still quite trivial.  Is the number even relevant, or is it how they are best leveraged with cognitive tools.?  And thus evolve to more value.   It is reported that the Microsoft Cortana kit for developers has been delayed.   Will this put Cortana behind?   CWorld Discusses: 

Microsoft delays tools for third-party Cortana integrations
Cortana Skills Kit was expected out in February, but it hasn’t materialized
By Blair Hanley Frank  U.S. Correspondent, IDG News Service  ... 

My list and survey of virtual assistants.