sign and trade for Thomas?
Ha ha. In all seriousness, trading Irving for prospects just doesn't make sense for this Celtics team. I think in a vacuum though Ingram and Ball/Kuzma for Irving is probably solid value given the uncertainty with both Irving's knee and contract situation. Again though, that type o trade makes no sense for Boston in its current position. Now if there was a 3rd team with a star coming back to Boston in the trade, that would make more sense.
Bos - Kawhi, Ball
LAL - Irving,
SAS - Ingram, Morris, Rozier, Bos 19 1st
In a vacuum, that seems like reasonable enough value for all 3 teams. Though unless Leonard and Irving both ask out, I don't see why either of those teams would make that trade.