The Mavs need to get back to the formula that pushed them to the Western Conference finals, they were strong at the guard spots and the starting wings but lacked any true inside presence and were very thin past the Bullock and Finney-Smith. I believe this trade would complete their offseason. Both those issue to have already been addressed to a reasonable degree. Adding Christian Wood and JaVale McGee will give them both a credible inside presences and by pushing Bullock to the bench (I'm assuming Christian Wood will eventually end up a starter at PF and play a lot of C as well) will give them more depth at the wing as well as THJ coming back. They need however to replace Brunson's spot without moving Dinwiddie to the starting lineup and leaving the second unit with no ball handlers (or at least bring Sexton off the bench if he can't beat Dinwiddie for the starting spot.)

  The Cavs clearly don't want to pay Sexton anywhere close to what he wants or a deal would be done. I believe they are hoping that with all the bigger fish tying up the top teams assets in negotiations and no one with any cap space who would realistically be interested they can just wait Sexton out. The Mavs should push hard to show Sexton they would give him the contract he desires if he pushes for a sign and trade. Cleveland's priorities seem to be avoiding the salary tax and maintaining flexibility seeing as they have a good team already and haven't bent at all in Sexton negotiations. This trade would fit with those goals, Powell offers the Cavs nothing from a basketball perspective but his salary works for a trade due to the base year compensations even if the machine says it doesn't. He is an expiring contract that would actually provide good trade filler if the Cavs decided to make a move if they come out strong this season and would keep them out of the tax. The first round pick is the actual compensation, if the Cavs continue to play hardball Sexton may just take the qualifying offer and walk for nothing. If his market is nothing as its been reported I don't really see any other teams offering more than 1 first and any team with a significantly better pick probably would keep it over signing Sexton seeing as he's a complimentarily piece to a team with a top player and in position to contend as opposed to putting them there by himself. 

  The new Mavs roster would I assume look something like this:

Starting
PG Luka Doncic
SG Colin Sexton
SF Dorian Finney-Smith PF Christian Wood C JaVale McGee Bench
PG Spencer Dinwiddie SG Tim Hardaway Jr. SF Reggie Bullock PF Davis Bertans C Maxi Kleber

 Please comment your thoughts, let me know if you think a better move is out there for the Mavs or if there is another Sexton move I'm not seeing.