I would have thought Minimizing errors, good defence, a good kicking game among other things have a fair bearing on having better possession stats. That’s not to say you are wrong about the forwards but they are only 1 small part of many other parts that add up to better possession stats.
Yes of course that is all part of winning the possession stat. But without the consistent go forward that the forwards and some wingers can provide to dominate the ruck, the most important part of the game, you know where it is all won and lost, then the pressure starts to mount.
Our kickers are then placed in awkward or downright horrible positions on the field when kicking. The players start to take extra risk in passing. The space just isn't there to play ball freely so the halves start to move way to much laterally. It all just seems clunky and disjointed as if the players don't know each other or don't know what they are doing. The forwards being dominated also means that sometimes they lose/drop the ball in what looks like a simple mistake, frustrating penalties...the list just goes on and on because they are being dominated.
That is why everybody bemoans the fact that the Storm seem to get preferential treatment by the refs. But the fact is that they dominate the ruck like no other team by having the best of the best dummy halves and an awesome pack that work their ringer off. The dragons are the same. Awesome pack, great dummy half and now they have halves and backs that can finish it off.
The bottom line is if if your forwards aren't winning the ruck then all the negative shit that we see on the field will just keep happening. Conversely if the forwards are good enough to win the ruck regularly, but the halves and or backs aren't good enough to capitalise, then the similar things will happen. But that isn't our issue.