Why Isn T Master Chief In Halo Reach

Reach and halo 3.
Why isn t master chief in halo reach. Mc is on reach but he is on his own mission at the time to destroy a navchip to prevent the covenant from finding earth at that time. Reach separately if the same store description says that i need halo master chief collection to play it and at that moment when you buy it you pay for everything even the things that are not there yet. The store description still confusing as to why are they selling halo. Xbox one compilation expanding with a long requested halo game.
Im sure with all the attention reach has gotten the launch time will be quicker going forward. I get it because the master chief isn t in it and this is the master chief collection but what about halo reach. Doesn t make zero sense. The master chief isn t in it but they decided to put that garbage game in here anyways.
Also to note reach should take the longest considering it wasn t apart of any mcc. 343 industries is bringing bungie s prequel halo. As for why they seemed weaker it could partially be due to the fact that most of them were spartan 3 soldiers rather than spartan 2s jorge was the only spartan 2 in the group at the time of reach. Reach to the master chief collection on xbox one and windows pc later this year.