Can you combine YouTube and on-site hosting as part of a Video SEO strategy?

[RobertChapman]

My question is sparked by how Moz uses its Whiteboard Friday videos.

We are currently capturing video stories from our customers. Its excellent and engaging content we'd love to share with a wider audience. I'm puttting together a strategy for video SEO to drive traffic to our site and Moz's approach intrigues me.

As we know, the world of video rich snippets changed in 2014 - their appearance in universal search reduced dramatically and what remained was almost entirely (90%+) YouTube snippets. Useless if you're looking to drive traffic to your own site. Of course, it's still possible to earn SERPs for video in Google video search, but I imagine the search volume is greatly reduced.

From what I can see, first Moz host their Whiteboard Friday video on Wistia, complete with transcript and whiteboard capture. Suprisingly, I see no Schema markup for video. Can anyone shed a light as to why this might be a good idea?

3-6 months later the same video is then uploaded to youtube, with the same title and a similar description.

The end result is multiple SERPs in universal search, almost always in the following order:

1. the original post on Moz
2. a YouTube result complete with a video rich sippet

This has me asking the following questions - I have some theories - but i'd love your input:

• Why use two platforms to upload and host the video? Why not just YouTube?
• Why avoid using Schema on the Wistia video hosted on the original post? Surely, this would allow an additional result in Google Video Search?
• Why wait 3-6 months after the first post to upload the YouTube video?