I have a theory that I posted in my thread, but I figured here would be more appropriate, I think Richard is going to attempt to kill Locke with Ben at his side, but at the last minute, Ben will double cross Richard and kill him to save Locke.
Ohhhh man, that would be shockingly awesome. I just hope they give more of Richard's history before that happens (if it does).
As noted previously Locke comes to the island with a cache of knives that had to do with his walk about.
This has been his "theme/thread" right along.
Is he a hunter or farmer?
as a child he choose the knife - he now leads them to kill Jacob.
The knife is significant. If in fact Richard was seeking their next leader and or Jacob he would want someone who would abide by the rules/laws. I am thinking Locke will end up advisor not a Jacob.
My two cents

You know, I've always wondered ever since I saw Walkabout, why did Locke have a suit case full of knives for the Walkabout?? I mean I can understand bringing one or two hunting knives, maybe even a Swiss army knife as well, but he had like 23 knives. Was he planning on sharing?? Weird if you ask me.