No, the Stork won't make it better.  He's proven he can't pre-read and his throws are arguably worse than Siemian's.

Invest the time in the o-line, the run game, and the game plan.  Siemian's still the best of the bunch.  The team needs some consistency, and if you wanna make that o-line look really bad, throw Wait-a-whiler in there, 'cause they have no feel how the stork moves around.