と([思「おも」]う、[言「い」]う、[考「かんが」]える) => That A N4
Particles
... はずみ.... => So N2
Result
と[言「い」]うのは => Means, is N3
Information, Report
~はいわずもがなだ      => need not to say N1
必ずしも~とは限らない => Not necessarily; not always N3
まずは => Temporary, first of all N5
Consider it
…ば…はずだ => If ... then perhaps ... N3
Speculation
はずだ/はずがない => it must be; it should be (expectation)/cannot be (impossible) N3
~やむをえず  => unavoidable, no other way to do something N2
Necessity, obligation
…も...ずに => without doing something N4
Status, contrast
…はずではなかった => cannot be (impossible) N3
Surprised
... おぼえはない => don't remember... N3
Position, perspective