I think the only way Kobe would have wanted Shaq back if Shaq said he would take a back seat to Kobe, even then I doubt he wants to play with Shaq because ultimately coaches would defer to the monster in the middle. It's interesting that Phil had to leave too if this wasn't all about Kobe.
Phil leaving had a little to do with Kobe, no doubt. But Phil also came back and won 2 more titles with Kobe.
Bottom line, both Kobe and Shaq let their ego's get in the way and neither of them acted in the most mature fashion at the time.
If they had it to do over again, I think it's pretty safe to say that each would have handled things a little differently.