i don't think l-walker and macdougal comprise too great a package for the unit (...*ahem*).
but without seeing your team, i can only guess. if you're stacked in the outfield, then great. if you're punting saves, then great. the trade makes total sense.
macdougal, i'd like to say, is not all that. i think if rj's owner goes for the trade, then do it. good luck.