Morris at the first link makes the case for behind > 9 regardless of time. I think the difference between Rodgers and Manning, Brees and Brady is remarkable but not definitive of anything in and of itself.
I do think his work plus Kacsmar's (the later links specifically about 4th Quarter comebacks) do have some explanatory power late in games. Rodgers is clearly on another level when it comes to caution. While I thought his numbers were skewed by poor defense (something that would need to be adjusted for all the QBs in the comparison), observation does tell me Rodgers does not take enough risks late in games when behind.