Nick Foles is not very mobile and struggles when pressured. We all know that. But who's to say that with an improved running game and somewhat better pass blocking that Foles would not succeed too.
Come on, Detroit, Houston and Minnesota are not exactly big time defenses. So what changed between the first Minnesota game where the offense never got into the end zone and last Sunday's Minnesota game?
Besides Trubisky replacing Foles, Montgomery was out of the lineup. And so was Minnesota's leading tackler MLB Kendricks. Also that first game was one of the last games that Coward started at LG and Ifedi was at RG. Both have been replaced or moved to a new position.
Another big difference is the play calling. Trubisky did not just sit back in the pocket like Foles did a month ago with Zimmer overloading a side of the line and generated pressure.
Not advocating starting Foles, but he might still be valuable as a backup next year, but he just might not be a cost effective backup.