Just a thought for GAC

GAC's biggest issue right now is 'activity'.  If opposition's attacks were blind, that may prevent more players giving up before they've even tried.  

Which might be another plus point to blinding the attacks.  From a personal point of view, I wouldn't prefer it though.

Yes, let's benefit the Western hemisphere in GAC. Don't the players know they shouldn't sleep? They should always be ready to hop on swgoh as soon as events go live.

That would only work in a very particular scenario.

Also part of the strategy in GAC is choosing a balanced defence and attack lineup, its absolutly fair which is more than can be said for your "first person who clears can reinforce their defence".

It also doesnt promote having larger rosters any more than it does now, guessing you aren't a late game player as when you get there you'll find you have it all anyway and only farm new stuff. 

Anyway, as it is fine, there is a benefit to going first- if I full clear (which I usually do) then there is pressure on the opponent to at least match my effort. In the event that I don't full clear then it means I've screwed up and I fully expect the L. In the current efficiency meta I couldnt care less what they do, my focus is on me clearing them as efficiently  as possible.

Easier solution if you want players to not wait for each other, blind them to the other players progress until the end.

If you want to promote players to be more engaged instead of waiting to win with minimal effort then give additional rewards for each sector cleared. (This is the main reason players wait).