Facey is like a knock down shooter who can't create his own shot at this point. You don't want to leave him open, but if you account for him, he's ineffective. Similarly, if someone identifies Facey on a rebound and puts a body on him and keeps it there, he's often neutralized.
It seems strange that he could have 8-8-9 in the rebounding department against our top three opponents and then get 1 against Columbia and 3 against Yale. I haven't scoured tape or anything, but I imagine a lot of it is that the mid majors and Ivies (believe it or not) are often better at rebounding fundamentals, since they can't afford to be caught in a jumping contest that they can't win. So they put a body on you and keep it there, and hope to get low rebounds or have their teammates come in. It's the difference between a guy saying "I'm getting that rebound" and one saying "my man is not getting that rebound." The one who wants it for himself will disengage from the box out early to go jump after it, and sometimes that helps a guy like Facey, who can be deceptively quick when the ball comes off the rim (for example, Emeka - the best rebounder we've had in my fandom - actually wasn't all that great at boxing out, but he was super human with his ability to go get it. He seemed to thrive more by making sure he wasn't tangled up with a defender). And then obviously the game starts to dictate strategy - if Facey isn't getting rebounds, and we can get away with Hamilton at the four to get more offense out there, Facey's minutes go down and he gets an ugly stat line.
Facey just has to get better at being a moving target against opponents where he has a quickness and jumping advantage (something Rodman excelled at in between piercings and tattoos, which is how he became so good in the NBA at 6-8, 210). And he needs to improve his technique on the defensive glass - he's still often a bit slow to react at that end of the floor in general. He leaves to bring help and then gets caught watching as the ball goes up instead of getting back to his man. He seems to be a step slow a lot as he's still going on reactions more than instinct, which is what got him yanked against Columbia (a step slow recovering to his man, who got a put back). At the offensive end, he can just go sniff out the ball - sometimes it's easier to go chase a rebound without a box out responsibility.
Maybe it's optimistic, but I think he could come close to 10 rpg later in his career if he earns starter's minutes. He does some things you can't teach and hopefully he'll get better at the things you can teach. His minutes next year may depend on what Stone does, but Facey also has the potential to make himself too valuable to keep off the floor very long no matter who is here, if he rebounds consistently and learns to defend on the perimeter as well as the post. Tough to keep guys like that off the floor, and I'm not sure Stone-Brimah could be out there together for long stretches against everyone, chasing a shooting 4 around the arc and hedging on pick and rolls. But Facey isn't there yet either, and I haven't seen Stone enough to judge where he's at with his defensive versatility. Hopefully, I'll see for myself a lot in the future (it's been real quiet lately - I hope he at least still has a short list and isn't answering the phone from new places).
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