I don't think this is for playbooks or anything else, it is for sure to force the hand of our FO. By trying to sign Harper, the 49ers and making us drop someone from our 53, which was obviously valued higher. It will be interesting to see what happens here.
As for TE, that could be as Harper has some of the widest shoulders I have ever seen in a WR. Actually in college he would just go down about 10-15 yards, do a quick curl and the DB could not get through/around him because he is so wide. The problem for them will be whether he can really block like a TE, as they already have Davis and rookie McDonald, so you would think a 3rd TE will only serve as a blocking TE. And also, how many big receivers do they need...Vernon, McDonald, Boldin, Baldwin...geez