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Speaking of when a Battle Master is KO'd, it states that you "play" the Upgrade side. Does that mean that you are technically Upgrading a character triggering effects like Wheeljack's alt mode? Furthermore--and I think I know the answer to this question--does this "play" take up the Upgrade for a turn?

Playing the Upgrade side of a Battle Master is just like playing an Upgrade from anywhere else. Wheeljacks ability will trigger. As you probably know, this does not count as the one upgrade for your turn.
Source: Wizards of the Coast (2019-04-12)    【Link to Ruling】
Tags: Battle Master