People have made this sort of comment before when faced with the above scenario but one of the things that I dislike about Jedi is it's mad rush to dot every T and put a line at the end of every sentence.
In a world where 1983 Harrison can be digitally replicated it might have been nice to have offered Han the chance to get even with Fett but have him turn it down because he had grown beyond that.
The only way I can see that being done would be to have the Falcon arrive just as Slave 1 is leaving and have Han have the chance to shoot him down but just say "Nah!" , an option that could be done with effects and existing elements like the Falcon cockpit etc.