ばこそ => only because ~ N1
…ば…ところだ(った) => If… (counterfactual condition), then would be ~ N3
Condition (condition contrary to reality)
からこそ/~ばこそ/こそ => precisely because ~ N2
…ば ... た => If ..., then would have N3
Regret
ばこそ => Because of A N1
Reason, Result, Response
~ばよかった/~たらよかった/~ばよかったのに/~たらよかったのに => If only N3
かりに…たら/…ば => If..., suppose... N3
Condition (hypothetical condition)
いちど .... ば/... たら => Just... once N4
Conditions (sufficient conditions)
~これ以上...ば => if ~ any more than this N1
Condition (hypothetical condition)
いったん~ば/と/たら   => Once you do something N2
Necessity, obligation
~としたことが => ~ surprised N1
Surprised
にこたえ(て) => in response to ~ N2