I agree that Buddy and Chan may not be on the same page. I don't think either that they are tied at the hip. Hard to see Buddy extending Chan at year end if the team has not shown significant improvement.
I think that Chan has had a big influence, for better or for worse, in personnel decisions. Spiller was his waterbug. Brad Smith was his decision IMO. I think Buddy brought VY in. Chan never wanted him. I believe it was Chan who sold Fitz to Buddy and Ralph Wilson after 4 games last year, thinking, wrongly IMO, that he had found the guy to run his O.
Buddy has given Chan a lot of rope and unfortunately Chan has put that rope around his own neck.
Personally, I sort of like Chan's offense. The main problem is that he has tied himself to a QB who does not have all of the skills needed to properly execute it. Ultimately this is the fatal error in the plan that threatens to bring Chan down. It's sort of a shame actually.