Jones has very nice footwork and mechanics. He looks like a QB should. He's like a Peyton Manning clone in terms of movement / throwing, which makes sense since they shared a coach. But then you watch him play in real live games and something is just missing. He's fairly safe and "correct" with what he does on plays, but sometimes in order to win you have to be willing to take risks. The amount of times I saw him immediately go to his checkdown on 3rd and 8+ was just infuriating. Yes, the back was open. No, he wasn't in position to move the chains.
A QB must be willing to move the ball in my opinion. I watched one game wherein Jones finished the first half something like 10/12 for 100 yards and no first downs (I'm exaggerating slightly here, but not by much). Brady is patient enough to dink and dunk when it makes sense, but he's aggressive with deep shots if he thinks they'll work, and he wants to string together first downs. Jones seems to be content to just take what's available all day but without the killer instinct. Is that fair? I don't know. He's passive, though, and I'm not a fan.
Grier needs to be reined in a bit, on the other side of the spectrum, and I think he's a round 2 sort of guy due to some deficiencies in play and technique, but he's the one I'd trust if I needed a comeback win. That's my unfair and biased take. Two years on the bench and he could be a mid-upper level starter, although likely not an all pro. I'll take it.