That simple, if Cleveland can add another big piece to their team without us at the very least matching it, we've given up all hope of beating them anytime soon. The reality is in order to beat them, we need a trade followed by a signing. 2 stars.
We have the assets to get this done, but if Ainge cheaps out and Cleveland lands Butler or George, it just moves us further away. We're in a position to not only improve our own team, but weaken the Cavs. They can still try to figure it out with a Melo or something, but we can't afford to let them outbid us. Lets gobble up the best pieces on the market before they can improve.
I think the best offseason we can have is George/Griffin. That has the absolute highest upside, but Butler/Hayward isn't exactly bad. Some combination of these guys is our ticket to getting through the east and getting a crack at the Dubs.
We just can't stand pat and be cheapskates, it's time to add 2 pieces and build our next contender.