While I do understand the allure of hypertrophy, I would personally advise against the "Bear" as the plan.
Yes; if followed (and you eat), the plan will pack on the size, particularly in the legs. But then again, a fighter has no need for heavier legs. Heed the words of The Chief when he warned: "On a side note, if you are a fighter and you are trying to gain weight, you are seriously confused about your needs and goals." [Return of The Kettlebell, page 8]
The chapter on "Armor Building" in Easy Strength is certainly worth a read, though.
I second the advice of taedoju above. If you intend to simultaneously train MMA skills 3-4 times a week (and I do acknowledge that you're no beginner), the "Bear" will still most likely be too taxing to add to our schedule for us to do justice to our sport practice.