You can't compare the Neymar case with Pogba. It's two completely different things.
Pogba would be great. But better than Don? No way. Don has the skill, vision and experience. Pogba is just more dynamic and physical. Iniesta can split a whole defence open in one dribble. Iniesta is maybe declining, but Pogba is still no where near Iniesta's level, even at 30+.
Pogba may be a good signing in the future, but Iniesta doesn't deserve to be binned at the moment.