I think you are overthinking it.
The selection of Love should only be graded on one and only one thing. Will he have a career in the NFL as a starting QB with the Packers or another team? If its a successful career with Green Bay, great pick. If its with another team, but the Packers get something valuable out of trading him, great pick. If he mostly rides the bench and isn't on the team in 4 years, bust. Fortunately or Unfortunately, we will all have to wait several years for that grade to come in.
Now the doom and gloomers might say "doesn't matter if he is successful, drafting him may have cost us a Super Bowl". To which I would ask which player(s) in this years draft did we miss out on by drafting Love and does that player(s) instantly change our path to a Super Bowl?
If Love turns out to be the Packers 3rd HOF QB in a row, the payoffs could be ten fold of what a Patrick Queen or a Tee Higgens could have been for the Packers. This was a calculated risk by Gute that the long term payoff of Love was worth the short term loss of drafting another player (s) instead.