There's no bodyfat percentage championship in MMA, so, forget you ever heard about bodyfat percentages. Base your physique progress on photos, how clothes are fitting, and how you're performing in the gym and on the mats.
This info really puts your photos into perspective. You're 6'4" and 200 pounds. That's skinny and cutting/losing bodyweight should be the last thing on your mind. You need to add lean muscle, which will improve your physique and your fighting.
Again, dropping weight is not what you need.
WS4SB would be a fine choice. It's been used by other athletes to add size and strength.
Not really, no. Although, since you're underweight and undermuscled to begin with, you may actually see some muscle built if you combine consistent hard lifting with abundant protein.
That program is crap.
Here's the deal: Your competition is in June. That's the primary goal. Looking hot by New Year's is the secondary goal. You'll get closer to both of those goals if you spend the next 12 or 16 weeks going balls out training hard and eating well. Adding, say, 15 pounds of muscle on your frame will have a bigger impact (pun intended) than cutting down and looking like The Machinist.
Use this to improve your nutrition:
It's nothing fancy, 3-4 meals a day and a workout shake, but it's effective.
Take a look at the dude pictured above. Jason "The Athlete" MacDonald is 6'3" (190cm) and a lean 185 pounds (84kg) there. That means he was a muscular 200 or so before cutting a lot of water weight. Right now, you're a not-yet-muscular 200 pounds, so why would it make sense to try cutting now. You need to put muscle onto your frame. That'll improve your strength, performance, appearance, and metabolism.