I got a couple ideas how to fix the cannon in halo reach.
1) maybe the pre invasion did happen but wasn't told in the fall of reach book. Like a prequel of a battle. To show this a video shows the guy who saw the covanent ship heading to reach that kees had to battle in space. The people who read the book will know all about that seen, and it will not confuse the new people to reach.
2) Kat death could be more emphazized. I know here shield s were down but, where are all the sparks that fly around you. If they showed the sparks, people won't be like " why did just one needle kill her!?" Also, when every one is running, carter could say "keep your heads down, our shields won't rechARGE For a whil cuz off the blast.", but Kat doesn't listen.
3) you could see mac defenses in the distance of some levels, because it is a unsc base type planet, so there could be some defenses seen in the distance.
4) When you get the cortana fragment from dr. halsey, you don't go to the pillar of autamn on the ground. You go into space again, and you go to the orbatil station that master chief and blue team was on to regroup with them to give the cortana fragment to him. Also, jun is killed by halsey because he finds out that halsey knows about the halos in a journal that was on her pelican.( the best idea for a death for jun that i could think of.)
5) you go abourd the space station, and carter dies from an explosion keeping a giant wave of enemys going onto a docking staion by blowing up a exsplosive charge or some fusion coils. You and emile go onto the place where chief waz with linda and where she waz shot. You are over run and emile tells you to retreat to another place on the staion. You go to a docking station where a wave comes out and you defend your self. After everyone is dead, emile tells you to get into a space sabre he sees, and that he will help the sparten 2( he doesn't know him.) When he go's through a door a elite feild marsheell comes out of claok and knifes him with a energy sword. Emile takes out a plamsa gernade and says " Stupid elite, spartens never die, there just missing in action" (After the elite says something cool.) You look one last time,then you run to the space sabre and have another epic space battle. You try to get to the pillar of autamn, but a phantom damages your ship heavily. Your losing control and destroy the phantom,so you radio the pillar of autumn telling keyes to go and you will cover him. You fight off the rest of enemys and the POA leaves. You down to the planet and crash land, and you will still have lone wolf.
i know i got some information wrong and i can't remember every halo detail. Like the blue team or where chief waz with linda. Correct me plz, but don't get pissed off correcting me.
[Edited on 06.29.2011 11:34 AM PDT]