The show isn't waiting for George and George isn't going to make the show wait. He will get TWOW out before season 6 then drop the last book ADOS when it's ready. The show will have been over for probably 3 to 4 years at that point. But the endings and the way they both get there will be different enough so it's not a big deal.
howland isn't the high sparrow. The only reason George hasn't shown him yet is because he literally has all the important information so he needs to wait to use him. There's a reason George gave him a floating/Invisible castle where he can only be found if he wants to be.
Yeah a lot of information should be in brans stuff this season I hope. We've finally gotten through all the "getting north to meet the three eyed crow" now doing something with that. I just want winds to drop though
Luke has always talked about how great veterans were helping him progress into the player he is today breaking down film with him, helping him get a better sense of the position and overall defense. I have no doubt in my mind Davis and Luke will have Shaq grasping everything he needs to know to be a real force inside this defense.