I think Brook will be beaten and take a beating in the process. He looked like someone who has the life ripped out of him
I agree he needs another big win to be fully classed in that category but I believe ability wise he is at that level. Thing about this he is fighting a guy who ability wise could possible be in that category, plus the guy in question is also in his pomp (best two in the division in my opinion).
Neither looked really drained to me. Obviously they're both lean and dehydrated on the scales but not to any unhealthy extent imo. Both will be physically fine in the fight, I'm not accepting any weight excuses.
Spence's chin will crack within 5. I'm not even a Brook fan, but this will be a relatively easy nights work for him.