Bruce Gradkoski was waaay more impressive in his first two starts - and we all know how that turned out. Once defenses get some film on Freeman he will likely hit a wall. Same thing happened to Gradkowski.
Gradkowski's first 2 starts:
@ New Orleans:
20/31, 225 yds, 2 TD, 0 INT
vs Cincinnati:
24/37, 261 yds, 1 TD, 0 INT
Gradkowski's next 2 starts:
vs Philadelphia:
13/26, 104 yds, 0 TD, 0 INT
@ New York Giants:
20/48, 139 yds, 0 TD, 0 INT
Once teams got some film on Gradkowski and figured out what to expect, he struggled a lot more. The same thing could very well happen/will likely happen to Freeman.