Edwards could use a stronger arm...but thats not the main problem at present.His arm is sufficient to get the job done--as was Brian Sipe's,Billy Kilmer's,Johnny U's,Joe Montana's,etc etc.
He just needs to develope more fire,more killer instinct...more mental toughness.
QBing is more about refusal to lose than about IQ. Case in point--Joe Montana,Terry Bradshaw,John Elway,Dan Marino,Jim Kelly.None of those guys is heading to a mensa meeting.Ever.