I took the liberty to break down Alex's numbers from this season. In this criteria, I used 4 quarters of the season (Game 1-4, 5-9, etc., with the exception that the last 4 quarter, he sat out on Week 17, so that'll be 3 games) and went by averages.
Here is the link that I used the stats from, and broke it down to averages based on quarterly.
https://www.pro-football-reference.c.../gamelog/2017/
As you can see below, from games 1-4 to the end, his completion percentage, TD's, QB Rating, and Y/A has declined with a
slight jump in the end, but not that significant.
So, to sum it up, I have no desire to see him back here in 2018.