Rondo's also taken teams roughly as far as AI ever did as well, and done it at a younger age. I don't think that really adds up to having a chance at a title with Iverson and not with Rondo.
Iverson's fellow starters were George Lynch, Tyrone Hill, Eric Snow, and Theo Ratliff (and later in the year, Dikembe). In the playoffs, Jumaine Jones started 2/3 of Philly's games.
Rondo's were Kevin Garnett, Paul Pierce, Ray Allen, and Kendrick Perkins.
I think there's a question about who "carried" Rondo's team to the Finals. There's no question with Iverson's.