Just about every inexperienced qb has those issues. So fid Elway, Bradshaw, Staubach, and most great qb's in their 1st to 3d seaspns, before they mastered the NFL. Then you get Warner, Plunkett and other great, who blossomed late. 

To dismiss Lynch this early is too early to tell. Let him learn as the backup. If he learns Siemian's ball control & decision making, he could surpass him.