QI starting during a GBG season has a problem. Let's say you take a break, go to another guild, temporarily, right after GBG ends. You lose out on QI rewards because QI still has a week left. Then when you want to go back, you have a similar problem, when to leave. If you are leaving to rejoin before GBG starts, you lose out again on QI, the last 4 days and the reward chests.. Why not have them start the same day? GBG can start, then 2 hours later, QI.
Then we can have 3 full days off from playing these 11 day campaigns. I always liked my 3 days, no GBG, wish it was more time off, 7 days would be ideal. If you use QI as the leave/rejoin basis, then you miss the end of season fragments.