What? Mma striking is the use of all mma techniques to outstrike the opponent. Using the threat of wrestling to outstrike the opponent is mma striking. Ergo, GSP is an excellent mma striker.
Furthermore, "GSP is not a striker"-- his base is in Kyokushin and he was known for his striking between 2004-2006. He is definitely a striker. Just because he decided to get really good at takedowns doesn't make him a wrestler. I am pretty sure GSP has never been in an actual wrestling match throughout his entire life.