The meaning of 以外 in this sentence?


> すぐにそのことに思い至らなかったのが自分でも **以外** だった。

Is he saying that he is surprise by the fact that EVEN to him, not realising
this immediately was/is something bad?

> Noun + 以外 : with the exception of; excepting

Is probably the only "以外" that I know..

Can you explain to me how am I suppose to interpret this "以外" ?

> それにしても、ハルカの主張は筋が通らない気がした。

And the second part is "Nevertheless, Haruka's claim, to me, make no sense"
correct?

thanks!

