Also, if both develop into their best case scenarios, along with Irving & Hayward still on the team, odds are that you've already won a title.
Maybe maybe not. When do players hit their prime? How old are Hayward and Irving going to be then or along the way to then? Can the team realistically keep all 4?
What team has better odds of winning a title, the one with Davis, Irving, and Hayward all in their 20's or the one with Brown and Tatum in their mid-20's and who knows what else (or course that presumes that Brown and Tatum are still on the team when they hit their prime which is far from a given)?
The OP didn't define a timeline, nor a prime window. These guys wouldn't have to necessarily be at "peak prime". If they're going in the "best case scenario" direction, even the upward trend towards peak would be at a high level. Most likely coming within the window of Irving/Hayward being on the team. Hence, if that happens, I think that a title is most likely happening.
Also, if you're in the "best case scenario" hypothetical, it'd be an overpay to trade these two guys for Anthony Davis.
You can't just assume that Brown and Tatum tomorrow are in their prime. That is just silly nonsense.
And again what is their best case scenario. Is it Carmelo Anthony and Paul Pierce? If so, is that duo more than likely winning you a title.
Adding Davis to Hayward and Irving right now is the must more likely title winning scenario. It isn't close.
Ah yes, your tiresome "silly nonsense" quip. The silly part is really you getting flustered with a rather undefined hypothetical & the seemingly lack of reading comprehension since no one talked about "tomorrow".
While what "best case" ultimately ends up being for two guys drafted in the top 3 is a bit ambigous, it's safe to say, based on historical NBA, that the ceilings would be pretty [dang] high. So if we're taking this hypothetical at its face which is "best case", its not hard to draw the conclusion that this means "all star". To get to prime, you have to first get there.
Even if their prime is a half decade away, its going to be rather apparent quick that they will be heading there in a "best case" scenario and not really far-fetched to believe that the quick rises will coincide with Irving & Hayward since both are with the Celtics through at least '18-19. Also, not far fetched to believe that "best case" Tatum & Brown along with Irving & Hayward (oh yeah, & Horford) could win a title. So why trade best case Tatum & Brown for Anthony Davis? You're trading two guys trending towards or already NBA all stars and coming off a title. As you love to shout time to time on these boards "Danny should be fired on the spot". I'm guessing you'd be doing that very thing in this instance.
Again, it's a freakin' hypothetical. In real world, yes, adding Davis to Hayward & Irving right now does make them much more likely to win the title. However, that's not the premise of what's being presented here.