I don't think this team was ever interested in Noel. Tommy has made it clear that he has a firm policy of no headcases.
https://thesixersense.com/2017/03/04/nba-rumors-nerlens-noel-locker-room-nuisance-mavericks/It is clear to me, given all the 1 year deals, that Tommy is trying to create enough cap room as possible for Plan B in case Beal opts out. The only other long term deals he has on the books are Wall and Bertans. Trading Wall is probably going to bring back equivalent salaries on the same term but you will probably be able to move Bertans this year for an expiring or cap space to a contender if he plays well. You do also have Thomas Bryant at $8M a year but that should be easy to move as well
With just Bertans, Wall (or the return for him) and rookie contracts, you'll be able to take on some bad contracts in exchange for picks next offseason like OKC has done and is going to continue to do. It's also why it made sense to take Avdija over Haliburton. He has a higher ceiling and better potential to be a star