I'm not convinced about Hamil. In practice he was able to take those guys down easily, but it's hard to gauge as his takedown skills haven't been tested, IMO, against an upper echelon fighter.
Rashad boxes more than he wrestles so I can't go with him either.
Koschek is very aggressive with his double leg. His hands are improving so I'll look for him to set his take downs up using his hands as a distraction just before he shoots.
Karo impresses me with his use of judo throws. The way he flipped Sanchez was a thing of beauty.
All the guys mentioned have good take downs, but I'll go with Koschek as I see room to embellish on good takedown skills he has right now.
Embrace the pain...train hard bro...TRAIN!