2014 Satchel Pierce 6'11" 250. Would've still given 5-7 minutes a game thru his Sr. yr.
2015 Johnny Hamilton 7'0" 215. Playing really well in D-League so there was potential.
2016 Khadim Sy 6'10" 230. Played well for a Fr. in ACC and averaging great numbers in Juco. Also had Seth LeDay. (We know what his brother did with little fanfare prior to his arrival.)
2017 None
2018 None
2019 None-ish. I say that because Blackshear was listed at 6'8" on his recruit profile. Maybe Yavez grows.

So, it's not an inability to recruit totally. There were other factors obviously that meant those earlier guys didn't stay.