I don't think Bo knew what to do in that fight. RDR has experience, is 6' 4" (height & length), big (fought at heavier weights), has world class submissions, and is a competent striker (dutch thai boxing). It was a perfect storm.
As for Bo's style in general I haven't been able to figure it out. He's been head and shoulders above his competition so far that I think he's still trying to figure it out. My opinion is Cain Velasquez's style would be a great blue print for Bo. Nickal has decent hands. I hope he doesn't go the Gaethje/Chandler route. He's far more talented than those two. He has potential but I really think AKA would be the right move.