I was at H4 Sports Academy in Edina two Saturdays ago and watched these kids train with other D1 prospects including Anthony Smith, Jojo Mitchell + a couple others I didn't recognize. My daughter was finishing her training on the adjacent court and we stuck around and watched them run 4-on-4 full court for about 20 minutes.
First thing I noticed is they weren't much taller than me and I'm 6'5" so I don't think 6'9" is accurate. I would guess 6'6" or 6'7." Keep in mind I wasn't back to back with these kids, just a guess as they we were all mulling around the gym in close proximity.
Both were very talented and physically dominating the runs. However, I don't think the physicality would stick out at the major D1 level like it did in High School, especially in the B1G. Ball handling was solid, but not exceptional. Both had solid jumpers, but (again) not exceptional. Both showed fluidity and quickness during drills, but you could tell that they were still working on their perimeter games. I asked one of the trainers how the SLPk team wasn't better and he told me defenses would just pack the lane and they would have 2-3 defenders on them when SLPk set up the half court offense.
I think UND is a great spot for these kids. If they continue to work, I could see one or both putting up great numbers and earning a high major scholarship through the portal.