Earlier quoted context omitted.
I'd add state machine diagrams if those aren't covered by your previous suggestions. I suppose they could be considered a subset of sequence diagrams.
Statecharts and other variants of state machine diagrams are quite useful, but they serve a different purpose than sequence diagrams. A sequence diagram describes an exchange of messages between different objects. A statechart describes the states of an individual object and how it transitions between those states.
Yeah I meant more like they have some superficial structural similarities to each other