you have a 2nd round grade on him, prior to him having been in the NFL, its a guessing game. but then he had time in NFL, there was actual film, albeit not a lot, but still NFL FILM. yet you still paid a 4th. that's stupidity.
and every QB who is not good needs playing time. will they be able to translate that into NFL QB level play is another thing. there are and have been tons of QBs, with arm strength, those can fly and run and blah blah blah, but couldn't play in the NFL because they couldn't read a defense presnap, post snap, go through their reads and be accurate.