Brook is a warrior. Prime Brook was elite. Making 147 at his age, with all the wear and tear on his body, will be a handicap. I really would prefer he was fighting Patrick Teixeira, Tim Tszyu, or Jessie Vargas at 154.
Yeah. I've always liked Brook as a fighter, and at this best, he was VERY good. But he's seen better days, and he's taken two high level beatings in his career against elite fighters. Now, he's nowhere near what he was at his best, and he's taking on arguably the best fighter in the world.
Brook will probably look better than he should early(due to TC's slow start), but after 4 or 5 rounds, I see him getting taken apart rather easily, and eventually stopped.