For the Bull's perspective, they have little interest in adding salary.
Secondly, beyond a pick, not sure WHY the Celtics would send anything of value (namely players that can be very good contributors) in such a trade.
The Celtics have trade a fair amount of salary if they acquire someone via sign and trade so pretty much either Smart or Richardson would have to go in the trade. If Smart doesn't sign his extension, I think Boston will move him. Plus, Boston could use a PF and I do think Markkanen can play that position.
I just don't think we need to do send that much value to get him if Markkanen wants to come here, which is the key.
Salary has to leave to acquire him though. so it sounds like you just don't want to acquire him, which is a perfectly fine position to take, but if Boston were to acquire him, Richardson or Smart is headed out that door and as the team is currently constructed, I rather send out Smart if he doesn't sign an extension.
Not all salary is created equal and I'm not positive that at this point we need to match salary as I think the Bulls (depending on how they order things) could have cap space so we could send less salary + $5 million (as in the contract need to be within that range) if we send enough out that we stay under the tax after the trade. This is a potential possibility, though not certain if that's possible anymore.
Yes at this point I'm not certain on who I'd prefer on the team, but you guys are treating this as it's Smart or nothing or as if he was the first choice to move.
In the end we have players like Dunn (if healthy) that can somewhat play the Smart role as it is to a lesser extent.
It'd be easier with a third team involved though.