Really, really rate Johnson, and think he would be out of our reach.
But i think if you did a roll reversal and Johnson in our side in Gordon's spot & Gordon in Steve Coopers side in Johnson's spot you would see pretty similar numbers in terms of what Johnson's got at Championship level & what Gordon has at PL level.
PL is a massive step up, and i'm pretty certain Johnson would eventually do brilliant, but that whole Forest side is designed for him to perform at his best , a move to a side like us probably wouldnt do that.
FWIW his style would be perfect for the RS based on how they play and how he plays. If forest go up, he wouldnt do much wrong sticking around and them trying to get him in 2 years, more developed