I totally disagree, with rondo already on this roster we have one piece for the future. If we can pull of a miracle and swing an expiring contract plus even our 2 firsts for a bad 2 year contract and a lottery first then with another stroke of luck that lottery first becomes piece #2.
You won't find a lotery pick for one of the expiring contract the team has on its books.
After pierce's and our 2 yr bad contract are off the books we could potentially have a middle of his carrier vet allstar (rondo) and a verge of being an all-star young player (barnes,kidd-gilcrest) and a team that hasn't been in the league basement for 3 years.
If you wait for the Pierce's deal to come off the books, it means 3 years from now. I'd rather see the team spend those 3 years in the lotery than fighting for a weak seed in the east and some early PO exits.
This is an attractive option for a big time free agent. Granted there has to be some good management (drafting),good player development, and a bit of luck.
Your scenario is not very different from mine. I think you are over optimistic about the post-big 3 Celtics. Next year, the team is not going to win 40 games. 30 is more realistic. KG is probably gonna retire. Allen may be traded by then (even Pierce!...). It means young players without experience.
The team is not gonna maintain itself in the middle of the pack in the east just because you have a Rondo+Pierce duo. They are gonna sink quick, granted Danny doesn't overpay a RFA next summer.
Your scenario relies on pure luck. If they are lucky, they draft the new Duncan in next June and they are gonna dominate for 15 years. Possible? Yep. Likely? No.
The most probable scenario is for them to be in the lotery for 2 or 3 years. There is no shame in that. That's the way you rebuild a team. You don't find a Duncan or a Kobe in the draft every year. It takes time to develop players. If you're lucky, you can find the right player and lure a good FA or make a trade happen.
In the meantime, they better be OK with being a bad team. It's always all about luck when you start rebulding, but luck might come next june or 3 years from now. Who knows.
EDIT: my mistake, I thought you were talking expiring contract for a lottery pick. They could probably find a top 10 pick with their 2 picks and their expiring contratcs, you're right. But they might as well have a top 10 pick of their own...