Interresting post!!! But let's wait until Kline actually wins the starting job at Cal.Frankly I'd take the stance that Cal will have a QB that does well in college before USC has one that does well in the pros because I firmly beleive that Zach Kline is better than any QB that USC has on its roster save for Barkley.
Now as for Barkley I really don't think he's going to be successful and it goes back to my original theory as to why the best QBs tend to come from programs that are considered decent/middle of the road.
Qbs at top schools are surround with talent so they don't have to rely and develop their own skills as much as QBs who are at schools where the talent alone can't win most of the games.
So when those USC qbs are thrust into dire situations with massive adversity they fail because they've rarely, if ever, been in a position where they were massively outgunned.
Barkley did suffer from less than stellar oline play but he also had quite possibly the best two receivers that USC has had on the field at the same time in Marquise Lee and Robert Woods.
Look at the top QBs in the NFL
Aaron Rodgers - Cal
Eli Manning - Ole Miss
Peyton Manning - Tennessee
Rothlisberger - Ohio U.
Luck - Stanford
RG III - Baylor
Matt Ryan - BC
Tom Brady - Michigan
Only Peyton and Brady are from a traditional powerhouse schools and Brady was completely off the radar.
If we take the top ten winningest college schools
only Tenn and Mich have top QBS in the NFL.
USC hasn't ever had a top QB in the NFL
Notre Dame had Joe Montana and Theismann
Michigan has had Brady
Oklahoma, Ohio St., Texas, Nebraska, FSU, Penn St. haven't had a top notch QB
Alabama hasn't had a top QB since Kenny Stabler