None of this QB situation is ideal... so I get what you're saying.
But here's the deal.... Rivers has worked with Reich and Sirianni before and know the system, and can mentor whichever of these new guys we might wind up with.
And at the same time.... Rivers gives us a puncher's chance in any game, provided we aren't racked up with injuries at WR again.
It's strictly a 1-2 year play at most.... and probably the best one among the veterans, IMO.
On pure talent? I would take Stafford at 32 years old.... but the Lions GM is on record as saying he isn't trading him...so it isn't realistic.
Carr is okay too... but the draft capital and $$$ for him or Stafford won't be as team friendly as a free agent deal with Rivers.
That's my rationale anyway.
I would expect that to have an effect, but if those changes cause him to go from looking like a really good QB to a below average QB, then I'd say he wasn't a really good QB to begin with. And when you watch his 2018 games you see his WRs and RBs bailed him out of a lot poor throws. He was also asked to make decisions based on his reading of the defense. That factors in as much as working with new players.
Again, I would expect it to have an effect, but I also thing his numbers looked better in 2018 than his skill level because of the type of offense that Utah State ran.
Basically, I do not think he is as bad as he looked in 2019, but unlike most people who want the Colts draft Love, I also do not think he is a s good as he looked in 2018.