First of all, it would not be a major shock if Hobson was cut. They signed him to a one year "prove it" deal, and if he's not "proving it," he's gone.
I also don't think he's telling us anything we don't know with Spann. However, saying he will play a big role is a stretch. Regardless of preseason playing time, he is behind Meriweather, Harrison and Sanders on the depth chart (I'm just assuming Sanders is ahead, don't know for a fact). We also are HOPING Lynch would be ahead of him on the depth chart. Spann will make this team, no doubt, but if the safety corps is fully healthy, he's #5. He's nothing more than an injury replacement.
But unfortunately, on this team, that role is more important than we would hope.