I wonder whatever happened to Leonard Simms (http://www.lostpedia.com/wiki/Leonard_Simms)?!
and Doctor Brooks (http://www.lostpedia.com/wiki/Dr._Brooks)?!

Is there a reason we didn't see either of them?!

Perhaps they both moved on.

When the Connect Four game came into view, the natural expectation was to see Lenny sitting there, repeating the numbers. Maybe he's cured. Or dead.