I think you are seriously overestimating the value of the Sacramento pick and Rozier. There is no way those assets, plus some super late 1st rounders, are enough to move into the top 7 of the draft.
I was on the fence if I may be over valuing the pick and Rozier but members of NBA media seem to think that its not that outlandish so I ran with it for the sake of this post.
I have said in the past the best gauge for this trade was the George Hill from the Spurs to Pacers for the #12 pick.
I wrote a long post on this but to paraphrase.
George Hill at the time of the trade was a slightly less effective player then Rozier. Both where roughly the same age and had one year left on their contracts.
As for the 12th pick that was used on Leonard at the time of the draft Chad Ford had him as a 3rd tier player. His tiers where intel based and the 3rd tier was for players who teams felt had all star potential but where not all star locks like tier 2 players. ( that year the tier 2s where Irving and Derrick Williams, with no tier 1).
2011 draft tiers by Chad Ford
Kyrie Irving (draft range: 1 to 2)
Derrick Williams (1 to 3)
Enes Kanter (2 to 6)
Brandon Knight (3 to 7)
Kawhi Leonard (5 to 9)
Jonas Valanciunas (3 to
Jan Vesely (3 to 10)
Kemba Walker (3 to 9)
My guess at player tiers this year would be the following. Not my tiers just a prediction of what GMS might be thinking based off of what I have read.
Based on this a Rozier for a pick trade should land the Cs a pick in the 9-12 range. Add the value of a future likely top 8 pick from the Kings and trading up to 4-8 seems more likely.