I think this is a great point (highlighted), we don't know what could happen, yet you say "the one thing we know is you add Josh Gordon.....instantly have the best receivers in the NFL" Do we really know that?
Josh Gordon's last big statistical year was 2013 and as Captain pointed out, is one incident away from being gone from the NFL. On the other hand, we have Randall Cobb who hasn't put up huge numbers since 2014, but has been a consistent part of the offense.
Someone like Josh Gordon is a huge risk IMO. Sure, he could be great, but I think the odds of him being a bust have to be considered. I would much rather see the Packers get Cobb to restructure and if he doesn't, spend the money on a FA that has better odds of contributing to the team for all 16+ games.