I wouldn't mind a ten day, and then evaluate what he can do
No reason not to try him on a 10 day.
If you go through the d-league stats on per48, there is nobody else close to giving what he gives in blocks/rebounds/but even more so if you throw in fg%. That Ohlebrecht guy at least shows up in the top 50 of blocks and rebounds per and shoots a slightly better fg% but apparently he already turned us down.
For comparison, Jerome Jordan seems to be a guy some people like, let us compare.
Jordan blks per48 3.98, reb per48 12.5, fg% .585. NBDL lists him as the #2 prospect behind Mack. Not bad.
Whiteside blks per48 7.54, reb per48 23.7, fg% .592. He is not listed on the top 10 prospect list.