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Speech act/Foucault: the illocutionary act is not that, what has been processed before the moment of the statement itself. There is more than one statement to make a "speech act": E.g. oath, request, contract, promise, demonstration. This is about series.
Statement: cannot have its own character, is inappropriate for an adequate definition.
Sign: means "existence of signs" that must exist. What does it mean "there are" signs?
Language/Discourse/Foucault: is never given in itself and in its totality. If there were no statements, the language did not exist. But no statement is essential for the language to exist. It exists only as a construction system for possible statements. On the other hand, it exists only as a description of how to get real statements from a set.
Language and statement are not on the same level of existence. One cannot say that there are statements, as one says, that there is language.
The Order of Things: An Archaeology of Human Sciences 1994
Archäologie des Wissens Frankfurt/M. 1981