I don't know. We have not heard anything in the media about the Suns pursuing or looking at anyone else. It's gone very quiet since Tucker. I would think that if the Suns already had someone specific in mind, they would have signed him by now.
Maybe the Suns don't have someone in mind as you suggest but they do have one roster position still available which will likely be filled by a center.
It could be the Suns are going to wait for someone to fall through the cracks in free agency, use the waiver wire, a summer league player or do a smaller trade using Miller, Dyson and Telfair with say the Laker second round pick for a center. Who, I don't have a clue.
Maybe the Suns even have their eye on a foreign player playing in the Olympics.
I just don't think the Suns are waiting for the sake of waiting unless they believe someone will become available sooner or later. Maybe the later might be the trading deadline.