Marks drafted Allen.People who watch the nets have told you the past five years that Sean Marks has not put a big body on that front court. This has been the same problem before any of these big names were signed.
And then it was KD who sacrificed Allen to bring in his mans Harden.
KD wanted that Big 3. He didn't want a balanced squad; he pushed all his chips in on Harden and Kyrie.
How were they supposed to have any big worth his weight in salt when this is what KD wanted? When that experiment failed miserably they were left trying to amend that situation and Harden inexorably forced their hand to trade him to Philly (who didn't have a legit big to send in return). But besides that, a big man isn't fixing the deep-rooted problem with this team.
It was doomed from the start.