If memory serves, I believe we had an equivelent offer to Barners - he chose to go with the Suns, which is where I would choose to go on a one year deal before heading back on the market.
The season is young, and Ainge knows what he has. Right now we have a dead-eye point and an athletic slasher coming off the bench - if he benches them in favor of the young guys they lose all value on the trade market.