なぜなら => A was done/decided because of B N3
Reason, Result, Response
てとうぜんだ => A is common, natural, not surprising N2
Adjectival, Descriptions
とはくらべ[物「もの」]にならない => It's no match for A N1
Comparison/ Exchange
も[同然「どうぜん」]だ => The same as saying A, as good as A N2
Adjectival, Descriptions