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Muffin-----I am in agreement with you on almost all of this. Horton was a very good DC. He did think outside the box, and most of all, he studied his roster and put each player into the best possible position to take advantage of his strengths while not exposing his weaknesses, but once he lost the HC position, he wanted out.
I do not lament the loss of Wilson and Rhodes. Neither are even playing this year. I agree with Keim-----(better to cut a year early than a year late)-----and he seems to have seen the writing on the wall. I only hope he keeps it up in the future.
Injuries have devastated what looked to be a decent roster this year. Cooper was bad enough, but to follow that with three consecutive OLB's is almost overwhelming. This will almost certainly force the whole scheme to look more 4-3 than 3-4. While those losses are for the season, it bodes well for next year, especially if Swope can regain his concussion health, and un-retire next year, (which is possible, while not probable).
All in all, if it had to happen, this year was a better one in which to absorb injuries without hurting expectations so much. No one should have been expecting really good W/L results this year.
The alternative apparently would have been yet another year of Whiz running the offense. I would hate to see how our QB situation would have survived his continued failure to help with pass protection. Throughout his history as our HC, he appeared to care less that his QB's were being beaten mercilessly, including Warner. At least Arians has provided some help to via using RB's capable of blocking, and at least using TE's occasionally to help against speed rushers. I believe we will see more of that as we go on, (or else he will need to go to a more mobile QB in Stanton). He simply cannot continue to expose Palmer to pressure like he has had to endure thus far.
Still we are but three games into this season. This staff and FO deserve the opportunity to continue what they have started. Let us see what transpires in 2013, 2014, and 2015 before we start calling for heads.