No it's not. A system quarterback is a quarterback whose offensive scheme is built around his skill set. At Florida, Tim Tebow was a system quarterback. Their offense was based on his ability to run the football first and throw second. When he got to Denver, their offensive scheme was not based on a running quarterback. Once they installed him as their starting quarterback, they changed their offensive scheme to suit his talents, thus changing their system, and making Tim Tebow, once again, a system quarterback. Aaron Rodgers could play in any offensive scheme; there would be no need whatsoever to tailor an offensive scheme to suit his skill set, because he is good enough to learn any offense and thrive in it. That's not a "system quarterback," that's an elite quarterback. My argument about changing offensive schemes but keeping them rather similar still holds true. It's really hard for a quarterback to go from one offense (like the West Coast) to another, completely different offense. However, in my honest opinion, I think a quarterback like Aaron Rodgers (and Drew Brees) can do it with no problems.