Over the past few months I've been back and forth on Joeckel and Fisher, eventually having a slight preference for Fisher based on him having maybe the higher ceiling.
Now I'm thinking Johnson might actually be the best fit of all for what we perceive would be required of a Chip Kelly O-Lineman, especially as he's the one with the most experience as a RT, where he'd be initially projected for us.
IMO either Fisher or Joeckel will go to KC at #1, and Dion Jordan to Jax at #2. Then a team will trade up with the Raiders to pick up whichever OT that KC discarded. Johnson would fall into our laps, and should be the pick.
Unless of course, someone goes all Don Vito on us for #4.....
You're scenario is reasonable. I could see Johnson falling into the Eagles' laps for the reasons you stated.
As far as 'ceiling' goes I tend to agree with what Ray Didinger said yesterday on WIP. At this point, the top prospects in the draft have been picked apart by the critics and draftnics; so the guys rising up the boards tend to look better because of their 'upside'. I'll continue to favor the original top prospects, like Joeckel, because they proved most importantly during their college play, and in some cases additionally during the combine, their pro days, interviews, and personal work outs that they deserve to be the top ranked prospects.