Speculation (Winston will probably leave)

Can Jameis read defenses?
I can't see how that is making that much of a difference. We are 3-7! Winston has a 1-3 record, while Dalton has a 2-5 record. Winston - 286 yd avg / Dalton - 223. Winston played hurt and Dalton is healthy. Where is reading defenses making a difference with these stats?