I don't agree with Ealing on everything, but it's hard to disagree with his assertion that Evans is in that elite first team group, and Gibson is very much on the fringes, more in a reserve/second team role.
And I'd also say that based on performances, Ferguson is bang on with his pecking order the way it is.
If somebody offered me one of Evans and Gibson, I'd probably go for Evans (at this stage).
Now that said, I'm happy we've got Gibson and I feel he's got the potential to become a good player for us, but sadly for him I think he'll have to move clubs if he's going to establish himself as a Premiership/European player.