Seems to me the Rams already made that decision.
Now that doesn't mean they won't change their mind. But again I'm not someone who holds Jimmy G on some pedestal of QB excellence. I've said it over and over: he's a QB who lives underneath. And we are all well aware that McVay doesn't want to live underneath. He prefers to stretch the field.
So to me Bennett's role is to function as a bridge QB2. And if you look at McVay's offense historically, he's shown an ability to survive with intelligent decision making even if the QB is not optimal. Kirk Cousins for example. And lastly I don't think there's some vast gulf between Jimmy and whoever else. I think once you get past the legit starter types you are splitting hairs and looking for traits that you prefer.
The fact the Rams chose Bennett is probably based on two things. First, he is cheaper. And secondly, he has the balls to consistently keep his eyes downfield. That's not to say he can see over the OL of course. But since we're talking backup role you're gonna be giving up something in the QB equation.
And then of course there is also the possiblity that Simpson shows enough to QB2 for us. I think it's somewhere around 60/40 for that to happen, because the Rams did make a significant investment in him and that matters. If he and Bennett are anywhere close in performance, then Simpson will win the job. Bennett has a lot of pressure on him right now. He has to slam dunk win that QB2 role.