Shaq needed a really good closer to work with him effectively. Young Lebron needed a lot more room than he would get playing with Shaq. It's fun to think about, but I don't believe he gets more than 3, he might not even get three. Unless you're cherry picking this current Lebron to play with Shaq, Kobe was not in his prime while playing with Shaq and Lebron is in his prime now.
For the record if we are cherrypicking this lebron to play with shaq, they win championships every year.
"If you find yourself in the majority, rethink your position" - Mark Twain