Of late. Top-20 centers with size and skill just haven't come to SU since DaJuan, he wasn't nearly healthy his entire time. Rak was great. Fab before him. But it's been 6-10 years since those dudes were recruited.
Chukwu was just a weird get. So was Obokoh. Both soaked up a few scholarship seasons while they couldn't play at a time when scholarships were limited. At one point, (15-16) SU was using ~28% of their allotted scholarships on centers who couldn't really play*. And the funny thing is that team went to the F4.
*36% when you add in a useless Kaleb Joseph at PG.
Not sure I really disagree with the premise that we aren't landing big time centers the past several years. Pretty sure Rak, technically, was a 4, so even he may not truly count as a big center commit.
But a couple nits to pick:
1) We have rarely landed big-time centers, really.
Etan was great, but not a big-time recruit. Forth was top 100 but he wasn't terribly exciting even though he was 7-foot -- you could tell he had limited upside from day 1. McNeil, Greg Davis, Ovicina, Arinze, Sean Williams, Baye Keita, Celluck, Obokoh -- all off the radar guys. Onuaku was great but not highly recruited.
Really the top 100 guys were Forth (limited upside), Dashonte Riley (ended up not doing much at a mid-major), Rick Jackson (bulky and decent size but more of a 4), Watkins, Fab and Rak, if you want to throw him in as a center. And that's going back to the days of Otis Hill in the mid-90s.
Really, if you ask me, Fab is probably the only true center with big time size and skill and a potential NBA future that we have brought in a long time -- maybe since Rony.
Point being, it's not like we've landed big-time centers very often period. Can blame that on JB I guess but I don't think it's really a new trend.
2) Why is Chuckwu a weird get? I honestly would like to see us taking more advantage of the transfer route and if I told you on paper that there was a 7-2 guy at a good program who was a top 75 recruit and he would have to sit out a year but then he'd be able to play three years for this program, I would imagine just about anyone would jump on that recruit. His sitting a year is a benefit, IMO, as opposed to a detriment.
Anyway, I'm late to your argument but the narrative I subscribe to is one of us rarely getting true centers (for better or for worse) and generally doing well with transfers, which would be a good thing.