Yes, figure in maple whether it be blister, quilt, flame, flitch, birdseye. and especially spalted are diseased maple. Beautiful yes! Stronger no! As I said the laws of physics has to stop working for his claims to be true.
Seriously people, you need to re-think this diseased wood kick that you're on. The only diseased wood from the list presented is spalted, and that's a fungus that invades a weak and dying tree that's too weak to defend itself.
Scientists have been studying the figuring in Maple for many years and not one of them can claim to know what causes it. Each has their own theory but disease is not high on the list of possible causes.
I can just about totally disprove the disease theory just from simple logic. Let's take birdeye for example.
The upper peninsula of Michigan is known as the Birdseye Capital of the world. Most all birdseye Maple is found there and it's surrounding regions, Wisconsin, Northern Michigan, Lower Canada and over to Northern New York area. Diseases are notorious travelers. Why hasn't this 'disease' shown-up elsewhere? Michigan is loaded with Maple yet birdseye is only found up north. If birdseye is a disease, don't you think it would have found it's way to the rest of the state? Birdseye has been around forever. It's had plenty of time to make it's move, but hasn't.
Quilt is the figuring of Big Leaf Maple that is found in our Great Northwest.
Outrageously gorgeous but hardly a disease. Big Leaf is a very healthy tree and grows like a weed. Big Leaf is a soft Maple and barely in the same family as Sugar/Rock Maple. Surprisingly, no birdseye found here.
A flitch has nothing to do with figuring. It's a board that has an outside edge of the tree still intact.
I'd be very cautious of making claims that you can't substantiate. It only exposes your, let's say, weaker side.
Having been a student of wood since I was a kid, I have my own theory about what causes birdseye and in an attempt to protect my weaker side, I'll just leave you with a question and it's answer.
Q). What do all of the regions where birdseye is found have in common?
A). The Great Lakes.
It's not my intent to condemn. It just annoys the hell out of me when people try to pass off mis-information as fact. Unless you're wiser than the scientists that study this stuff, it's only a guess, isn't it?