It is a true rarity for a single person to be able to carry on a conversation with themselves for an entire sporting event and to keep the listeners involved. This, to me, was the true brilliance of Arlo. You never got sick and tired of hearing one person's opinion, or felt that the broadcast really needed more than one person in the booth to be able to understand all that was going on. Arlo could call the game while not letting the little details go by without mention. I don't think another like him exists for the Sounders right now. Arlo's shoes are too hard to fill with just one person. I think two people will be necessary.
Taylor Graham will not be the one to fill the color commentary role, but he could be the one to do the analysis. He has played the sport for years (many of them in Seattle), is liked by the players, is bilingual and can translate interviews, is smart (Stanford, nuff said), is funny (judging by the work he did for the Sounders Website over the last three years), and is retired and looking for a job (see front page story). I'm no talent scout or anything but Graham could be really good in that role (way better than that player we had with KC in year one who seemed like he was slipping in and out of a coma during the game).
However, the most important thing is finding someone who knows this game and loves it as much as we do (and as much as Arlo does). Without a good play-by-play guy, no amount of jokes or solid analysis will save us from a cringe-worthy broadcast. I'm sure the Sounders will find someone good, but they probably won't be great. Thats why two may be better than one.