All depends what you want to do. Personally I’d never buy a jumbo bird. I’ve always cooked smaller birds as I like the taste and flavor of them and they cook relatively quickly and evenly on the bbq.
Since you’re doing to break it down, a larger bird could be manageable and you can pull the white and dark off at different times, when they’re done.
I’ve never made a butterball so I’m of not help there. I usually wet brine in salt water with frozen orange and pineapple juice concentrate in the brine and assorted spices. All my birds for the past 20 years have been fresh kill, not deep frozen.
Then after 24 hours wet brine, rinse, dry and rub with evoo, herbs and pepper and garlic and a small amount of salt.
Unless you’re at 350° or higher, your skin will be rubbery. We like crispy skin so I’ve done indirect at 350° after searing all the skin sides over direct heat to mark the skin and start the render process.
24# is a jumbo bird. If it were me and I needed 24# weight, I’d cook two 12-14# birds and get them done quicker. And to me, the taste on a smaller bird is better than a jumbo. But that’s just my opinion.