I also struggle to see AB, Smart, IT and TR existing long term on this team. That said, the group is doing a job for now and three are a big part of how this group play. I get the feeling that IT and AB are the longer term players on this squad. That remains to be seen though.
Amir and Lee are here due to Sully and KO not doing everything required in those positions, that is not a long term fix either but is working for where this team is now.
Bottom line, there does seem to be a theme in DA's drafting but I think it is coincidental, not a plan.