The first part, you're also correct, I don't "know". But I also know that it doesn't matter what he thinks of Carr. He's going to lean on the run game his first year to start. If you truly understood football you would know that. The players will have an entire new offensive scheme to learn and get synced with. Even if every offensive player returns, it will take time for them to learn the scheme and get in sync. Training camp is not enough. Pre-season is not enough. The running game is the quickest and easiest offensive scheme for players to execute successfully. The passing game is not. We will very, very likely be a running team to start.
And drafting for the future still requires us to start looking at RB. Kamara will be 31 after this coming season. Miller can't stay healthy. Clyde misses games and practices due to PTSD. Whether your drafting for some help this season or for the future, we will likely add a RB.
This stuff isn't hard. Any and all sports are swimming with patterns and the NFL is no different. There are patterns that consistently work and patterns that don't. Just like with Dennis Allen, anyone who watched him coach the Raiders for 3 years saw patterns and knew he was very likely going to be bad. Just like with every first year coach, they tend to lean on the running game far more then passing unless you have a Peyton Manning/Tom Brady, prime Aaron Rodgers or prime Drew Brees long after shoulder surgery, which we don't.
The probability of what's going to happen is quite literally right there staring at us.