Oh, I can see why someone would ship them, I just don't see it myself (at least not yet). I mainly see the Merlin/Mordred storyline as competition over Arthur and a place beside him, rather than latent desire for each other either as friends or lovers. I do, however, agree that Merlin has always wanted a connection with other magic users, and that he might be able to find that in Mordred. Not sure if the storyline will take us there because of the prophecy and also because I predict a lot of envious Merlin mad at Mordred moving in on his man, but we'll see.