One big hole in your theory. Samsung don't release sales figures, just shipments. ..
Samsung normally doesn't detail
any figures, for the same supposed competitive reasons that Apple doesn't detail Apple Watch figures or their iPhone model sales breakdown.
So we have to rely on analyst figures for discussion.
As for "shipments vs sales", that's a popular point of confusion. "Sales" in company reports do not mean just "end user" sales. They also include sales to retailers' stock, which is the overwhelming majority of quarterly reported sales revenue.
That accounting method is also used by Apple. In fact, as noted in their respective SEC filings, the biggest difference is that Samsung doesn't record a revenue sale until a device
arrives at a retailer, whereas Apple includes it in their public count the moment that a device
ships to a retailer.
When we see headlines like "ten million XX sold the first weekend", many of those are units only sold to retailers, and might even be still in the process of being shipped to them. Often, millions of those highly reported sales are not yet ultimately resold to an end user.
The upshot is that everyone... including Apple... uses what you seem to be calling "shipped" figures. But to Apple and others, it's been "sold", because they already got paid, even if the units are sitting in a store's warehouse. Analysts use the same method, with rare exception.