In the tips and notes to the skill "Adjectives - inflexion" (https://www.duolingo.com/skill/el/Adjectives-inflexion), I think that "relevant" should be replaced by "relative" throughout.
"Relative superlative" contrasting with "absolute superlative" makes a lot more sense to me than "relevant superlative".
I had not noticed it before. I can't access the incubator today. As soon as I can I'll correct it. Thanks.
I'm afraid not, but the source I heard that from suggested "Our feet are (the) same" for what you say in German when you leave.