I didn't say he was too light to play DE, I said he was too light to play LDE on a regular basis. Taylor is a 255lb speed rusher, I think he'd struggle if he was moved to LDE on a regular basis. He's also about 20lbs too light to be a proto-type anything.
The point is moot, there is no way, no how the Dolphins are contemplating trading Taylor for Henry. Even they aren't that stupid.