Look at this photo. Brooks at 184 is noticeably shorter than O'Toole 165, Starocci 174 and 6" shorter than Nino Bonacorris at 197. Parris may be close to a head taller than Brooks. O'Toole is listed at 6'0 so I estimate that Brooks is no taller than 5'10. A typical 197 pounder like Tanner Sloan is 6'2.
Brooks is amazing and strength won't be a problem at 197 but I can't help but wonder if his lack of length will be an issue against the longer 197 pounders.