You keep saying this, but you have yet to base this on anything at all. How have they improved so dramatically?
Not dramatic improvement, but improvement nonetheless. Starting with the offense, this year listed first
QB
Huard/Croyle > Huard/Green I haven't heard a single person say Green had even a mediocre year last year. He was borderline AWFUL last year and its not a stretch to say Croyle could and would improve over what Green did last year if he was to become the starter. Huard didn't scare anybody last year and won't again this year but should be more comfortable in a starting role this year and the offense should be geared more towards his strengths than it was last year.
Advantage this year
RB
LJ/Bennett/Smith > LJ/hurt Bennett Obviously a holdout changes everything, but I'm not too concerned about that. The big workload is a slight concern but I don't predict injuries. Bennett played well last year and assuming he stays healthy can give LJ some rest that he didn't recieve last year. Smith adds depth to the position that wasn't there last year.
Advantage this year
TE Gonzo = Gonzo Gonzo hasn't really started to decline yet and I don't expect much of a drop in production this year either. Obviously the team feels the same way or he wouldn't have recieved the contract that he got.
Push.
WRs
Kennison/Bowe/Parker/Webb/Hannon > Kennison/Parker/Hall Kennison is old and won't be as affective as he was last year, but the rest of the squad has nowhere to go but up. Bowe is an upgrade over Parker and Parker moving to the slot is an upgrade over Hall. Webb and Hannon are impressing the coaching staff and should add some nice depth and one or the other could dethrone Parker.
Advantage this year.
LT
Mcintosh > Black Admittingly I haven't seen Mcintosh play really, but I have seen enough of Black to state that he very well may have been the worst starter on ANY team at ANY position last year. If Mcintosh is even a mediocre LT, this is a fairly big upgrade.
Advantage this year.
LG Waters = Waters If anything, Waters could still be better this year than last. One of the best Gs in the game, and theres not a whole lot that needs to be said about him.
Push.
C Wiegmann <
Wiegmann A mediocre center who is on the decline. He is still serviceable but not a strength by any means.
Advantage last year.
RG Welbourn <
Shields This is a downgrade, but not nearly as big of one as those not in the know seem to think. Shields is one of my all time favorite players, but was not playing at a pro bowl level any longer and was simply an above average G last year. Welbourn is back at his natural position and should play at a decent, reliable level.
Advantage last year.
RT
Bober/Terry/Svitek > last years committee Whoever wins the starting nod should be an improvement over last year, and it goes without saying that the two that don't win the job add better depth to the line than was there last year.
Advantage this year.
While none of the positions have significant change from last year, I still see the majority of the positions an upgrade over last years squad which was still not as bad as people think. Top half of the league in points and total offense last year and its a safe assumption to assume they finish around there again this year.
Now where the significant improvement is, the defense. I don't have time to treat this the same as I did the offense, but I think most can agree the defense, which was borderline top 10 last year, should be significantly better and could crack the top 10.
DEs
Allen/Hali/Bell/Mcbride/Wilkerson > Allen/Hali/rejects The Allen suspension obviously hurts, but there is depth here that should be adequate in his absence, and Hali was a great rookie but should show improvement into a good to great DE.
DTs
Boone/Tyler/Edwards/Reed > Reed/Edwards/Wilkerson/Simms Our two starters from last year are both still with the team and neither will be starting. I think that means its safe to say the position has been upgraded and that they will make better backups than we had last year.
LBs
DJ/Harris/Edwards >> DJ/Bell/Mitchell This is a massive upgrade as Bell was borderline worthless last year, and seeing what Mitchell fetched on the open market shows you what kind of player he is. Just getting them off the field is an upgrade and thats not including the actual addition of a leader like Edwards and an above average LB in Harris
CBs These are the same as last year, and that has to be considered a downgrade considering the starters ages. They are still an above average tandem though and losing a step isn't as big of a deal in a Cover 2.
Safeties
Page/Pollard > Knight/Wesley Two young safeties with loads of potential. There will be some growing pains I'm sure, but both showed flashes last year and everyone in KC can't wait to see these two in action next year.
Defense is upgraded in every position except CB, and in most cases is upgraded significantly.
A possible top 10 D and an offense that should be better than half the league, doesn't look like many reasons to worry in KC. 8-8 to 10-6 and competing for a playoff birth again this year.