You shouldn't use the word "evidently" when it's anything but.
You thinking that Disney would sign such a deal directly contradicts your previous statement that, "Disney may not be stupid, by neither is Netflix." because that would be a stupid deal for Disney to sign.
Disney could not, in 2013 when the deal was done with Netflix, sign Wilson Fisk, i.e. Kingpin, away exclusively to anyone. Sony had, at that time, rights to the character as well.
Netflix not making a decision on Luke Cage does not mean Luke Cage is exclusive to Netflix as long as Netflix wants. I don't see why that's hard to understand.
I don't know what the contract says. Even though I highly doubt it, Disney may have signed a 90s style contract like you think they did. I find it highly likely the contract has an expiration date and the characters are not exclusive to Netflix. If we could take a look at the contract I would be willing to bet in the 5 or 6 figures that would be the case. You are acting with certainty that you know what is in the contract and the terms that were signed. And you think the terms state that Disney signed the live action rights to a few of their character in de facto perpetuity when they haven't done anything that dumb since Oswald the lucky rabbit - and even that was a different situation altogether.