First: Von Miller says hi.
Second: Eagles won a SB and it wasn't because they had Foles as their QB even if he won MVP and Manning was a name but his only job on the 2015 Broncos was to not turn the ball over and give the defense time to rest and he knew it. Can you even tell me who the QB was for the 2000 Ravens without looking it up? You are basing your statement on the last 20 years or so in the Brady/Belichick era where it has almost always been about the QB because the QB is/was the GOAT. Rodgers has always kept the Packers in the hunt but has only gotten a ring once and the biggest reason is because they never give him a team, Big Ben has won it three times but do the "Killer B's" ring any bells? (No pun intended).
Third: You want to talk Ravens and Joe Flacco ok I'll talk Ravens and Flacco with you.
Flacco came into the NFL as a stop gap QB or luxury backup except that he had two things going for him, the fact he actually was very good in bad weather conditions, something important in Baltimore seeing as it's an outdoor stadium in Maryland, and that he had a first time HC by the name of John William Harbaugh. Now the Harbaugh's are to football coaching what the Manning's are to QBs and he had a GM, Ozzie Newsome, that knew it. Newsome had been with the Ravens literally since they were in Cleveland and working with Belichick he knew the best way to win is to pick the right HC and then get them the team they want. Harbaugh knew the best way to win is to build a complete team and then custom design your scheme around that team.
Flacco was a decent QB but he was also a prime example of coaching matters because you see after the 2012 SB, and his big pay raise, Flacco started to believe his own hype and that started the downhill slide. He did have a pretty good arm but he couldn't read a D to save his life, Harbaugh could read a D. It also didn't hurt that in that SB Flacco was throwing to Bolden and Jones, had Ray Rice as a RB and on defense he had Ray Lewis and Ed Reed. If you want further proof look at how good the Ravens are doing with Jackson, a QB that is just Newton 2.0, and its because again Harbaugh rebuilt the team around Jackson. God if the Ravens had drafted Mahomes or Watson they would be the new football dynasty instead of KC.