Leach left, running game degrades as the games go by. What is more important than a top running game to the Kubiak offense? Nothing. Casey makes a few catches but really doesn't do much....Casey is the one being romanticized.
Not sure I understand the degrading of the running game.
2012 = 2123/4.2 YPC/19 TD
2011 = 2448/4.5 YPC/18 TD
Leach's last year in 2010: 2043/4.8 YPC/20 TD
If you look at the total production in the two years he has been in Baltimore compared with the two years before he got there (Rice has been there four years = 2 with and 2 without), the Ravens running game has virtually the same yards, APC and TD's. 2000/4.3/16
If you want to point to YPC decrease, especially this year, there are so many factors: time killing running plays in 4th quarters, new right side of O-line, Tate not being able to keep himself healthy.
And yet, in spite of all that they still finished in the top 10 for rushing yards and top 5 for rushing TD's. Throw in the fact that they were a top 10 passing team as well, and only one team in the NFL had more passing AND rushing yards, the Patriots.
So in the end, the Texans let Leach walk and kept their production. The Ravens gave him a huge contract, and kept their production. I'm going to say the Texans made out just fine in the deal.
As far as Casey goes, he either gave you better production out of the backfield in the passing game than Leach ever did in his 5 years here, or he gave you #2 TE stats, because his numbers this year were comparable to the last three years that Dreesen had. Considering that Graham was the #2 TE and did not get as targeted as much as Casey did as the FB, especially considering the two-TE sets that this team employs, it shows that Casey could be a very adequate #2 TE.
I'm not stating that Casey is or ever will be the pure blocking FB that Leach was. Casey should not be paid big FB money because he is a hybrid. But let's not pretend that he was hot garbage out there and him walking away would not a detriment to this offense.