With Miranda ready, there won't really be 3B AB's for Arreaz IMO. And playing him in the OF is not ideal.If they did that (I don't think they will), Polanco would still probably get his fair share of starts at SS. So Arreaz could easily play at least 1/3 of the time at 2B and 1/3 at 3B.
I'm pretty certain they will sign a veteran SS for 1 year again. I'm not sure Gordon will ever be an everyday player. But he could be a solid speedy utility guy.