Realistically, who knows what level Cousins might achieve during the remainder of his young career? Will the league figure out ways to take advantage of his weaknesses and make his ongoing success difficult? This is something that happens frequently with one-year wonders.
At present, there's just no way he should be considered comparable to Tony or practically any other long-tenured QB in the league, for that matter, in terms of overall mental preparation and adaptability. Experience is inherently crucial for any QB if they're destined to experience a highly successful NFL career. Reading and beating opposing pro defenses is no overnight proposition.
Yes, Kirk is plenty good for a young QB but he still has lots to learn before he compares with the likes of Tony Romo and many others who have already paid their dues.