I believe its all from the same hand, none of which are the Pistols - poor attempt really and the Johnny Rotten looks like its taken the faker an age to write.
There are two critical things about the Rotten sig that make me feel uncomfortable. I looked back at some genuine 1977/8 ones and the big problem on this one is the J linking to a non existent o and the rest of the h and n. Second is the R- it's unique to any I have seen from this era which gives me (personally) a red flag.
The Paul Cook looks good, Sid has been forged so many times I no longer know what is real and fake of his and Steve Jones is typically inconsistent (sometimes capitals, sometimes like this).
The reason I would not go for it I don't believe it's John Lydon's signature and the others are easy to forge, be interested in other's opinions...