QBs who are definitely ranked above Geno:
1) Mahomes
QBs who you can make a convincing argument for being above Geno on the basis of production but have their own issues with consistency:
2)Jackson, 3)Allen, 4) Burrow
QBs with a promising future and very early in their careers that you might want to take over Geno today:
5) Stroud, 6) Purdy
QBs who are probably around the same level as Geno IMO but I would struggle to be convinced that they are significantly superior:
Prescott, Herbert, Love, Hurts, Tagovailoa, Goff, Carr, Mayfield
QBs well past their prime and one injury from retiring that I wouldn't rank over Geno as a result:
12) Rodgers, 13) Stafford 14) Cousins
There's nobody else in the league that I think you would take over him.
On that basis I think 5-10 is reasonable, though it's more like 8-12 really. If you want to argue that someone like Love or Carr is better than Geno at any given moment you are welcome to, but I don't think there's all that much between them that it's black and white.