The Bengals evidently recognized that this is a significant down side to Reader and had him lose weight so that he could become quicker, more of a pass rush factor and a 3 down player. By limiting his carbs during the offseason, he has managed to weigh in now at 320 lbs............down from ~350 lbs....................a weight loss of ~30 lbs. Such a weight loss may affect his run stuffing ability and do little for his pass rush ability. When you look back at his Clemson days, he always had problems with weight control, vacillating between 320-340...............and during his entire college career, he was a 2 down rotational player, not unlike his stint with the Texans.
I don't believe that the Bengals will be getting their money's worth. Drastic player weight losses don't tend to consistently translate well to increased strength and balanced overall performance improvement (with significant weight loss, the tendency is........... the Lord giveth and the Lord taketh away). In fact, with his weight drop in the NFL (as compared to what could be the case in college competition), he may very well be less not more the player he was with the Texans.