This is not a very satisfying reason, but the rumor rings true to me. I've heard that the reason Armstrong doesn't get more playing time is that he is basically getting the Seth Wand treatment. Pendry doesn't like him (for whatever reason) and is therefore loathe to play him unless he has no other alternative. Matt Murphy is also a member of this less than exclusive club, and he dresses out for the games mainly because the coaches need a 3rd tight end in case one of the first two get hurt. He got in a little deeper yesterday. Apparently Pendry was so po'd at the false start penalty on Murphy (4th and 2, 7:48 of the 1st quarter) that he jerked him out of the (very few) other sets he was supposed to play and used Rivers instead. This led to some confusion when running the different teams on and off the field. It would have cost the Texans a delay of game or time out once, but time was running out in the quarter and we were "saved by the bell". The interesting note is that while the refs called 81 for that penalty, Pitts moved first and then Murphy - check the replay. Pendry seems almost irrational with players in his doghouse, but I guess that isn't news.