My two penny:
Did Geno single handedly L this game?
1. Did he throw a pick 6? No
2. Did he throw INTs? No
3. Did he fumble at the wrong place wrong time? No.
4. Did he mis-execute plays? We don't know, but probably not.
So no, he didn't single-handedly hand the game to the Bears. How did he do?
1. Did his over, under throw his receivers? Yes, a few.
2. Did he had perfect passes dropped? Yes, a few
3. Did OL helped him? No, too many penalties.
One thing we know for sure, Geno didn't call his own plays, and being preseason, coaches want to test certain plays, in my book, Geno probably deserve a C+ or B- in executing Shane's plays.
Geno played better than want met my eyes. But he also showed his ceiling, when things weren't going his way, he didn't have that extra gear.