A lot may depend on what we do with Grant. If we keep Grant, then I think we are fine with the big (PF/C) rotation of Porzingis, Horford, RWill, Grant, Kornet, and maybe a 2-way player to add. If we sign Grant, the focus should be a Richardson or Oubre type of player, a G/F wing type. But if we don't sign Grant, we may need to address back up PF first.
Free agency is going to be interesting. Oubre for example is coming off of a $12.6M contract, essentially a non-taxpayer MLE. Is he going to be happy with some or all of the taxpayer MLE ($5M or less)? Is he going to have any other options? I don't see where the money is going to come from for players like this (Grant included).
As to the Celtics, we probably are not even going to be able to offer the full non-taxpayer MLE. There will be fill out the roster holds added to our current salary of about $173M (the second apron I believe is $179.5M). We got out of having a first round pick (and guaranteed contract) but we still have so little room to maneuver, basically all we can do is sign/match Grant and offer min contracts, and of course sign draft picks.
I am not sure how it works for Begarin. Can we sign him even if we are over the second apron? And how about Davison, can we sign him if we are over? I guess we can to min contracts?