Tank for 10th? No, you don't tank for the 10th pick. The chances of getting good talent at 9th or 10th aren't appreciably higher than finding a player at 16th or 17th.
Once again, the misconception about the word "tank" rears its ugly head.
No, you don't outright "tank" for the 10th pick.
Do you make the choice to be a seller at the trade deadline instead of a buyer? Yes, I think you do. That's not tanking, it's just arranging your priorities for the future.
Brandon Bass is not the future.
Jordan Crawford, most likely, is not the future.
Courtney Lee is not the future.
Jeff Green and Avery Bradley may or may not be the future.
Looking to sell high on those players for future assets doesn't just help the team have a worse record this season. It opens up time for players who probably do have a future here, and also increases salary cap flexibility, which is huge. It's tough being a rebuilding team with salary obligations all the way up to the luxury line. Making the team less competitive in the short term is an added bonus.
In the big scheme of things, picking in the top 10 is better for the future than playing a meaningful first round series against a team slightly less mediocre than ours.
Whether or not the players you mentioned could be used in trades to set us up better for the future wasn't what I was debating.
I was debating whether a 9th or 10th pick is so much more valuable than a 16th or 17th pick that it's worth purposefully getting worse for. I contend that it isn't.
Back to your above list of players, I could definitely see possibly one or two of those players getting traded this season, but I have a hard time imagining Danny trading all of those players.
Further, it's my opinion that trading off either of the first three probably wouldn't make us appreciably worse. Bass is somewhat expendable because we have two younger guys at his position with more possible upside. Crawford is expendable because we have a perennial all star returning at his position. Lee is expendable because he is behind Bradley at his position right now.
As for the last two, I definitely don't think they are moved unless we get back good value for them. And, by good value, I don't mean purely for cap relief (which, by the way, it would be impossible to trade Avery for, as he becomes a free agent this off-season) and draft picks. I think Danny would want actual, established players who can be counted on to help the team win ball games, both now and in the future.
I'm going to wait and see what happens, but I don't think that Danny is going to be able to make this team worse unless he trades all of Rondo, Bradley, Green, Sullinger, Bass, and Olynyk for washed up expiring players and future draft picks. And, I just don't think that scenario is likely.