They are extremely different as players and I'm not sure Caufield ever turns out as good, but sure. I'll admit that I'd take a Theo Fleury (minus the drug problems) on my team any day and be pleased with it.
I disagree massively with what you've posted, with all due respect.
Joe is a HHOFer and probably amongst the top 30-40 players who ever graced the NHL (#32 actually based on HfBoards' History of Hockey board). He's probably also my favorite player of all if I must be frank as I grew up watching him dominate much of the time and loved seeing him in action (except against Montreal).
Sakic played the game relying on his all-world hockey sense, excellent skating, crazy cardio, high intensity and efficiency, tremendous puck-protection and lower-body strength, insane skill level, elite playmaking, was amongst the best in the NHL possession-wise for years, owns one of the Game's all-time best wristers and probably the single best release in history, all-around great arsenal of shots (slapper is less impressive but his wrister makes up for it a lot and that was what he used the most by far), great two-way ability, a seemingly preternatural ability to find ''weak'' points to attack in the offensive zone with his (all-star) teammates, was clutch as all hell, as well as a true-blue professional and gentleman to boot. What is even more impressive than all of that is his marvelous durability and the unbelievable level of play he maintained even 20+ years after he had been drafted by the Nordiques.
For a long time he was the single best captain in the NHL and had intangibles up the wazoo, enough to give Toews a run for his money.
Now that I've said that, I believe you can understand the type of struggle Caufield will have trying to match even just a fraction of Sakic's level of play, nevermind actually living up to his entire legacy (1600+ points, more than PPG in the playoffs over his entire career with 188 points in 172 games, many individual awards, etc.).
Outside of achievements and accolades, if we only look at Caufield's attributes as a hockey player, it is clear that, while extremely impressive aside from his height, strength, and defensive play, these attributes and skills still fall far short of the absolute beast that Sakic was, and that's no slight to Caufield at all.
On a personal note, I love Caufield as a player, and the Flyers will regret having handed him to us in a couple of years I'm sure, but he's not gonna be Joe Sakic and he also has a 99,99% chance of not being an HHOFer. That, however, doesn't mean he can't be an absolute beauty of a hockey player for us. With that in mind, let us tamper our expectations, watch how Caufield develops from here and sincerely cheer for him from the bottom of our hearts on his pursuit of his dream, as we must do with all our prospects.