There is a lot of Marko and Tom in the bloodline. Marko's sire, Grim was one of those hard dogs with lots of prey drive. As for Tom, most people use him in their breeding program because of his overall good nerves and for conformation. Both very good dogs, but as stated, there is too much linebreeding there mostly on the dam side.
Anyways I know the sire's breeder and my current pup is from him. If you need more information, drop me a PM or post back here.