Yup. Rivers should be upright more than last year. He was only sacked 34 times (16th in the NFL) last year with the 29th ranked OL. If he can be average in terms of sacks with one of the worst OLs, he'll be fine with easily a top 5 OL. JB was only sacked 27 times (tied for 23rd) with his high TTT, and struggles with reading Ds. I wouldn't be shocked if Rivers was sacked 20 or fewer times.
As far as time to throw goes.
Brissett 2.93 (31st), 2.89 in 2017
Rivers 2.63 (#5 lowest), 2.62 in 2018
Luck 2.63 in 2018, 2.88 in 2016
No matter what he accomplishes from here on out he will never be the GOAT anyway, that is Micheal Jeffrey Jordan, Magic Johnson at his peak was better too. Just to compare Magic vs LeBron:
Championships = Magic 5, LeBron 3
Finals appearances = Magic 9, LeBron 9 that is actually even for the LeBron fans using the Warriors excuse for not winning more championships. Magic went 9 times.
Efficiency = Magic 52% FG's, LeBron 50% FG's. Magic 85% FT's, LeBron 74% FT's for their careers. Most LeBron fans use efficiency as to LeBron being the best ever. Magic was more efficient.
Finals MVP's = Magic 3, LeBron 3. Even
League MVP's = LeBron 4, Magic 3. LeBron has only 1 more but has played 6 more seasons than Magic did.
-Magic won Finals MVP as a rookie and a championship, LeBron couldn't win a championship until his 9th season and had to join Wade and Bosh to do so.
-LeBron will have much more career points and rebounds but it is because he has played a lot longer. Magic will still have more assists even if LeBron plays 20 years.