From a judicial stance, it makes sense for Strategy to hedge the litigious risk by "passing the ball" to Coinbase, as the majority of companies are doing, the set standard.

What about his personal stack? Last I heard he personally had some 18,000 BTC, but where?

The MSTR stash is not his stash, at the end of the day he's just an employee bound by a board of directors.

An eye on the player, another on the game.