They always knew he had a weak arm...they went with the selling point that his speed will make up for his weak are and offensively he would be able to provide an OBP that would allow him to utilize his speed.
Making Revere the 4th OF was a poor choice from the start. Because:
Would you truly use him as a late inning defensive replacement with his arm?
Is he a decent enough hitter to allow him to pinch hit it tough spots?
Did he really have any other use as a bench player than as a pinch runner?
The answer to all three of these questions is a resounding NO. So, why was he added to the roster in the first place?
There may have been other factors...such as baseball intelligence maybe...
I remember last season when Revere was supposed to lay down a bunt to move a player over, but was told to look for the wheel play and if it was on to slap the ball through the infield...after Revere successfully bunted the runner over and returned to the dugout, he was asked (paraphrased) by Gardenhire, "why didn't he try to slap the ball through the infield, the opponents had the wheel play on? Revere responded, "What's the wheel play?"
Just maybe there was more of that lack of baseball intelligence going on in that head.