Packer fans are typically the most crazy, so they often skew the betting line, so that Vegas has to compensate to get enough people betting against them. Thus the 2.5 at home with Rodger's status 'uncertain'*
I'm not sure about your claim about holding off on betting until Superstar status is determined. It seems to me stars are injured all the time in the NFL, their status is 'unknown' all week, and yet betting continues. That's just my impression - I don't follow it close enough to know for certain.
*I'm 'betting' Vegas has well-compensated moles in the various organizations giving them inside info