と考えていい ending sentence meaning?

Question

In Season 2, Episode 3 of Shingeki no Kyojin at 12:30, I encountered this sentence:

その表層は硬化した皮膚で形成されていると考えていい

I understand its meaning literally is: "I think that this surface is constructed by harden skin."

But I searched everywhere and can't find と考えていい used anywhere. What is the meaning of adding ていい? is it a little redundant? Thank you.

Answer 1

I would translate と考えていい as: "You can think of it as...". It's like a shorter form of 〜てもいい.

Your given sentence would be something like:

"You can think of that surface as being molded/formed from hardened skin."