My legal signature is illegible and I don’t use capital letters. I don’t spell it all out either.
My handwriting, on the other hand, is very nice.
Most would make sure their signature on legal documents is neater than usual. Most wouldn’t use a name they aren’t known by. When all the letters are relatively legible, most don’t obviously leave out a letter in the middle of the name. Blasey/Blasy seems more like someone didn’t realize it contained an E and was going by the pronunciation. Sort of like that oopsie with the 4 boys but one turning out later to be a girl with a boy’s name. That’s a mistake a third party would make.