It takes 12 men working together to make things work but some positions bear more responsibility.
Cavillo must bear the greatest responsibility for a number of reasons. He calls his owns plays. He has abandoned the running game in effect creating an unbalanced offense. His current playbook is replete with schemes that have be done to death over the years with little or no creativity or imagination to keep the defense guessing. He has become as predicatable as Tracy Ham had been in the last few years of his career. To be effective, he will need to change up his play calls and get the running game going early. He needs to exhibit more patience by sticking with a shorter passing game until the long ball potential opens up. I also believe that he needs to start seeking more input and direction from the O.C. A pocket passing QB with limited mobility can not produce in this league if he doesn't use all of his weapons. Danny Mac (probably the only QB less mobile than Cavillo) does that by using a balanced offensive approach and having one of the quickest releases ever.
On the offensive line, there is no doubt that their armour has cracked a bit over the last 2 or 3 games and needs to be shored up (Dave Mudge... you are missed!) but this is still the line (for the most part) that has been considered among the best time and time again. As I have mentioned in other posts - I have no doubt that this has mostly resulted from the lack of a running game. O-Linemen love to and are conditioned to run block, even in the pass happy CFL. It is a pure 'attack' mode for them. Pass blocking requires more effort, skill and patience and is more 'defensive' by nature (not as much fun). Running the ball gives the O-Line a chance to punish and wear down the opposition (a good confidence boost particualrly if the running game succeds). When the d-line is less aggressive out of a need to defend a possible run, the QB and receivers will, more often then not, have more time to connect. Likewise, when a running game is being established, linebackers tend to play tighter to the line which also opens up passing lanes/routes. It is a balanced approach that the Alouettes' once lived by and were successful with. They need to return to that idealogy while adding a few new wrinkles to the playbook just as they have been doing on special teams.
The defense is one that is hard to understand. They have all of the tools and weapons and can be absolutely dominant one play, and invisible the next. With the exception of Stewart, rush end is a concern. Someone needs to step up and take over the other end spot and put a stop to this constant shuffling in and out of personel. Truluck can domniate if he stays healthy and disciplined... the lack of the latter being his downfall the previous 2 games or so. The Als' also need to find a way to get Kai Ellis in more regularly and at a set position, be it on the end or at linebacker. The secondary has the talent but lack of pressure up front and by the linebackers will not help them... Karikari has been a flop this year. The Als D is going to need to find itself quickly if they are going to make it to the big game out in Winterpeg!