And we have to see what happens after this new wave just got released because I feel the Imperials may have gotten the advantage in this latest wave. But again I will wait to see what the evidence shows. As for BCC it is a very useful tool that everyone wanted to try and play. And since it is available to both Imperials and Rebels I don't see it as a disadvantage for anyone. Everyone has it available for use.
But it also is still not the only factor to look at when looking at the evidence, it is of course there as part of the reason, but it also shows that players that are willing to play more balanced lists with both squadrons and ships do have the current advantage. Now you can fly a Squadron-free list but you can not fly a Ship-free list. So for me the evidence points to players bringing a healthy balanced list that includes a decent portion of Squadrons or a screen to stop your opponent's squadrons. (I have been bringing a defensive screening of squadrons instead of an aggressive style of squadrons. And so far it has been effective at keeping my opponent's Bombers at bay and that leaves the game to my ships to get me the points. The days of flying squadron free are over. Otherwise I like the data and your assessment isn't that far off.)
I think your logic is dangerous.
You could have gunships and a large set of squadrons for AA support. You are rarely going to have lots of squadrons AND BCC where you aren't a primary bomber list intending to do its damage from bombers that will also do well in a large, competitive field.
Rhymer + 3 Bombers + 1 Gozanti with BCC is just a really odd addition to a list with no other squadrons.
The numbers are also saying that average winners have 8-9 squadrons ash, THATS a bomber list.
The lists that have a token squadron force or none by and large get wiped out upon each successive level: 16th, 8th, 4th, 2nd, 1st.
It seems strongly that large amounts of squadrons bombers list are winning, and lists with only token support of squadrons are losing.
No one is really talking about no squadrons when we say we want ships to do more of a role in damage. Even token 4 squads are now being wiped out by bomber and 8-10 sq lists.