Bo seemed weirdly terrified of the prospect of engaging Craig on the ground to the point that he was willing to risk losing a razor-thin sparring match with him on the feet instead. I'm not saying he should have grappled in that fight necessarily, but he did show poor fight IQ by never adjusting what he was doing and letting Craig fight his fight the entire time.
If he's not willing to grapple with Craig, I don't see him being willing to grapple RDR despite his showings in no-gi against the likes of Oliver Taza, Gordon Ryan, etc. So we'll likely see another sloppy kickboxing fight where Bo tries to use his wrestling defensively... which I assume he can do? No one has really tested him there yet inside the cage and RDR is an unexceptional wrestler who relies on one-dimensional entries sometimes.
That said, people keep talking shit on de Ridder's striking... but he acquitted himself well against a vet in GM3 and has way more reps than Bo. Nickal's striking is still very basic and again... dude nearly lost a sparring match to Paul Craig on the feet. I could see him getting outhustled here if he doesn't crack Reinier.