それこそ => exactly that N3
Emphasis on degree
それでこそ => Such N3
Cause, reason
これ/それ/あれ => this/that N5
Spatial relations
それはそうと => anyway N2
それを => Despite that ... N2
Things do not match the prediction
それでは => So (Inference) N4
Deduce
それでは => Well then N4
Change the subject of the story
それは => That/That's it N4
それはそうと => By the way N2
Miscellaneous
それほど => to that extent N2
Base, base
それから => Afterward, from that N5
Happens next
こそあれ => and; although; but ~ N1