I'm just not a fan of Krysten Ritter in general, so I wouldn't want her to play Jessica. I've never seen Palmer work, so let's put her in third. De Gouw was pretty good in Arrow, so we know she can act and she can handle action scenes, putting her in a strong second. But I just happen to love Alexandria Daddario, and with her work in the horribly written Percy Jackson series (for action) and he stuff from True Detective (as evidence of acting) I think she'd be a good fit. She looks a little young at times,but beyond that she's a good choice.
I've never seen anything that Lance Gross has been in, so I'm not going to comment on him. Mike Colter on the other hand is freaking awesome. He's awesome in the Good Wife as Lemond Bishop, so we know he can play the less than legal aspect of Luke. He's a little older than I imagine Luke being this early in the series, but he's a strong contender. That said, I will always have aspecial place in my heart for Isaiah Mustafa when it comes to casting Luke Cage, that little fan film he did was pretty cool, and he's got the passion so there ya go.