Valid points, no doubt. Jacares athleticism puts him over right now, but on current form i see Luke beating him again. When you look at Rogers record in BJJ, its a whos who of world champions he has wins - in some cases multiple wins -over. Sure hes lost on occasion but Sperry, Ribeiro, Machado, Jacare, Werdum, Maia, Garcia... i dont see anyone better than him in MMA at pure BJJ.
Maybe Royce was right, why try to dilute your skills by utilising boxing, wrestling etc when you train your whole life to choke someone out / submit them. At its purest level im not sure the elite practitioners actually need boxing & wrestling, if & when they get hold of you its more than likely game over.