Taking Lee for a pick seems like a Danny type move.
It does, but only if Danny strikes out on the FA market. Lee has no long term future here, so he's a one and done guy.
Lee doesn't fit under the trade exception and since trade exceptions cannot combined with other players, the Celtics would have to take him "naturally". That adds about $16m to the cap - or $6m if it's Wallace going back. I could see a trade of Lee + 1st + Barnes for Wallace + restricted 2nd + non-guaranteed salaries.
It would be worth it for GS, but I'm not sure if it would be worth it for the Celtics. Barnes has been in the league for 3 years and isn't exactly starting material. He's about to turn 23 so his long term development may never be greater than a role player. Lee is just sitting on the cap for this year. The 1st rounder will likely be 25+. Is that enough? Not so sure, especially if taking on Lee hinders the ability to use the trade exception elsewhere.
Faried for the exception is something I like.