I enjoyed the episode but it caught me by surprise. There wasn't much advertising about it's return and I almost missed it.
As strange as this may sound, perhaps Ben believes in sticking to the rules and that's why he can't or won't kill Widmore. That old man is evil and deserves a good killin'.
Their "game" or "rules" caught me by surprise. Ben went to this island as a child, how did he develop any kind of relationship with Widmore? At what time did this happen? As usual, more questions pop up when others are answered.
I assume that Ben has teleport powers as well. That's the only explanation my small mind can come with at this point.
Other than Barbara Hersey in real life, yeah, Sayid's luck is pretty rotten. To find his love Nadia after being stuck on the island for however long they were there and then to have her die ... There is speculation that Ben killed her to reel Sayid in as a partner. If that's true Ben's a dead man when Sayid finds out ... and he will find out.