Depends what Veteran:
1) you don't want a mercenary malcontent, bad influence on a young team
2) you don't want a 30 year old who is starting to break down (Bryan made that mistake more than once in Toronto)
If you can find a 24-25 year old veteran who's blocked from starting and has that kind of potential, plus the right intangibles, and is a good fit, yes, that's the point of accumulating assets, to use them to add players who are good fits. But don't overpay.
This team is going to win 20+-30 games in any case, 5 more wins doesn't make them a playoff team, you're not going to be able to obtain a difference maker, so don't waste resources that could put you over the top in two years (that 2018/2019 Sacramento pick could add the "missing piece.").
If Embiid is healthy, and can play 25-30 minutes a night, this is a 30 win team regardless of who they add, he's going to be that good.
Add Saric, Jah with a year of experience, and a top pick (if they don't get the top two, they'll still get a solid guard for the 8 man rotation), and you have a good start.
If I'm trading, I'm looking to move some of my backups plus the OKC and/or Miami pick for guards.
Say Holmes, Canaan and one of the 1st round picks for a solid second tier guard.
And I'd be looking to sign a solid role player in FA (but don't give a big contract to a second tier, aging "name").
As Houston shows, having two "stars" doesn't do much good if they're not the right stars, and they don't have a good supporting cast.
Get your stars in the draft, build a solid supporting cast around them, and don't go for quick fixes.