I wouldn't be concerned that anything "shady" is going on.
A lot of times, kids commit to schools with knowledge they will be preferred walk on year one, then placed on scholarship next year when a schollie opens up. example- a school only has 1 left and is in desperate need of a PF but also really likes a PG. knowing they have 3 guards graduating in 2018, they tell the young PG, we really want you, come as walk-on year one, we will redshirt you and then put you on a scholarship next year. PG who loves the school and has means to pay for year one, takes coach up on that offer.
at UNC, Luke Maye was recruited as a preferred walk on. when a scholarship opened up, he received it. the same thing for Shea Rush this year. UNC is going to have a numbers issue next year as they have 2 seniors and poss cam johnson leaving(as a duq and unc fan, do you know how happy that made me to see unc get him from pitt?),. they currently have 3 commits and are hosting several others. most likely Luke and Shea will give up scholarships, since they are renewed on yearly basis...
in other words, I'm sure coach d, etc have a plan and we have nothing to worry about