Yeah, call me an idiot, I guess, but Marcus Smart plus a non-BRK 1st seems like what Philly would expect at the very least.
It was widely reported that they couldn't get a top-ten pick for him in this past draft, and they were ultimately going to trade him straight up for Teague, who was ultimately traded for the 12th pick. So his trade value is pretty well set right now around the league, i.e. a mid to late lottery pick. So Smart and a first is most definitely an overlay at this point all things/context considered.
Of course, you said what "they'd expect," which is totally different than what his trade value across the league is, or at least what they'd end up getting for him.
But I agree with LarBrd33 that I don't think Smart is that great of a fit for them anyways. They need more shooting, and while they could surely use his perimeter D, they have bigger holes to fill. Rozier's offensive potential and better shooting makes him more of a realistic trade target than Smart, and he's more in line with Noel's value - Rozier, Young, and a non-Brooklyn pick for Noel.