Yea, you're right, but that's kind of why this is a crappy spot to draft. Membou is an upgrade to both their tackles. Little always gets banged up and Harrison is a bit of an unknown for now. Don't forget, Little was on the bench for Cam Robinson before Darrisaw went down and the Vikings traded for him. Cam is an ok OT, and Little being benched for him, being younger, says something about where they value him.
I understand if they prefer to keep that crew and pass on Membou, but the OL in Jacksonville needs work. Guard is the bigger need, but again, no way at 5 overall. So... my thinking is Membou locks down the RT spot. If Little shows signs of not lasting with his iffy knees, then Membou can slide to the left side one day. The hope would be that Harrison can then find a home inside. But, who knows... maybe Little moves inside or maybe they don't love Little enough to begin with. And ultimately, my real point is I don't love picking at 5 if I'm the Jaguars. I rather move down and get better value cause offense at 5 doesn't seem like the best fit.