Jaylen is a heck of a finisher. Very impressed thus far.
And Portis is clearly a starting big that has shown he can step out and hit the 3.
At least Yabu looks like an Ainge-reach that has a chance to work out, though...
So bashing Brown and Rozier and saying Portis is a starting caliber big. Summer league..... 
Portis was a starting caliber big when he was playing well in starter minutes in Chicago last year due to injuries. It was well-documented that CHI was ready to move on from their bigs to clear space for him.
Rozier looks fine, I'd prefer him to Smart. He doesn't project to be a starting PG, though, does he? He's another SG (with an inconsistent shot) in a PG's body.
It'll be apparent all season that Dunn was the BPA at 3. Whether his injury history is that bad, I don't know. But Brown is far, far away... and most everyone liked Dunn at 3. It's already looking like a no-brainer.