I almost exclusively stuck to game tape when evaluating these quarterbacks myself and I had no problem putting Garoppolo as the 6th best quarterback. You confuse game tape evaluation with comparing statistics. Numbers never lie, but they never tell the whole story.
For example, say Tajh Boyd had 300 yards passing in a game with 3 touchdowns and a pick. Sounds good right? Well it isn't quite as impressive if he had a 65 yard touchdown to a wide open Sammy Watkins because the corner fell down in coverage and another 50 yard touchdown to Martavis Bryant because there was blown coverage and the safety dropped in the box instead of covering deep.
Also, the process in which the quarterback finds his targets is important. I've seen Teddy make full-field reads. You can literally see his head go from the primary receiver, to the secondary receiver, to the backside receiver or tight end, and finally check it down to the back if all else fails. I saw Jimmy making simple 3 step reads (primary receiver, check down, run/throw the ball away). Because of this, his mental progression is behind Teddy currently. Can he improve and catch up mentally? That remains to be seen, but he could. All I know is that Teddy is already capable of that.
Because of this, we would not rate Jimmy the highest quarterback in the class. It isn't about how many touchdowns and yards you get, it's the process in which you get them. Any NFL quarterback can hit open receivers, the ones who can dissect a defense and have full control over their offense and game plan can become great. It is simply asinine to think a combine or pro day stacks up to a players actual resume which is his tape. It also doesn't take a genius to realize that at EIU Jimmy wasn't playing against top competition, everyone who evaluates takes that into account.