Nice to see your vid, I watched that whole series years ago, while impressive it doesn't prove that we all use only 10% of our brains.
Agreed, who knows what the percentage is but it does prove that we are massively underusing our brains . In essence, Daniel only has the same brain as you or I, it is physically no bigger, it is just wired differently.
Personally, I actually believe Daniel's visions are of the spiritual nature, a similar gifting to John who saw "in the Spirit" Revelation 1:10, Revelation 4:2, Revelation 17:3, Revelation 21:10 and other believers Acts 2:17, Daniel 1:17, Numbers 12:6.
My wife gets a lot of visions, some which she can explain but others seem to be literally out of this world, she has a hard time describing what she is seeing.
Whilst I am on the subject, the Lord gave her a vision of inside my head. She said there we a mass of wires all over the place, all different colours and stuff. The the Lord showed her inside her own head. She saw just two wires running straight across from A to B! It doesn't mean my wife is dim, just we are wired differently. As much as I think about things a lot and consider issues from all sides, she often just goes right to the solution, whilst I am still thinking about it.